Some ideas

Personally I would go with bright ,colourful rug and accessories
http://houzz.com/photos/568254

The furniture in the photos are quite nice, just needs some finishing touches such as art work and accent colors.

Thank you all for the ideas! And witch accent colors do you think will fit better? I feel stuck because of the wall color and the wood color too. I don't want it to be something heavy or too serious.

Do you like the red in the lampshade? Perhaps use that as a jumping off point...

Oh, very nice examples! Yes, I do like the red. Actually, the lampshade came from my previous house, where the living room was decorated mostly with red. I was hooping to have something new, but red matches fine here too...

Can you paint the walls? Painting can open up a whole new palate of colors and ideas! :))

If you had red before, you may want something different? What is your favorite color? What is the main color in your clothes closet? Let's do something different.

That's it Darzy :) Well.. What makes it hard for me is that, in fact, I love many colors and I'm not afraid to use them. Red, blue, green, violet, gold, silver... Yes, painting the wall would make it easy, but I was hooping not to...

Possible rug?

I love this rug.,,

i would go a warm grey for the walls

As for the original issue, I think the walls are a neutral off white- kind of like a B. Moore linen or Navajo white, correct? In that case, absolutely colors you choose should work just fine. I thought the lampshade was an orange-y red which I particularly like with the walls and sofa. For inspiration, I would goto a place like Home Goods and see the area rugs. Choose one you like and match curtains, pillows accessories to it.

Elisabete,
do you have artwork that you will be hanging in the room? Maybe you can pick a colour from that as a cue for the rug, curtains, pillows and whathaveyou :-) Another idea could be just to keep the large things, like the rug and the curtains, neutral: greige, grey, beige, white... And then you can bring colour in with pillows, art, beautiful glass bowls or vases on your sideboard.

Some colorful rugs would spice things up too in this room, Check out my online store for alternative items: https://www.etsy.com/shop/TurkishCraftsArts

With the canvas you have provided, you can color it with almost anything. Need to find one thing you consider a "must have" in the room and then easier to provide coordinating suggestions.

Jesus... If I wanted professional help I would look for it by other means. But I don't have a budget for it and, even if I had, I would never hire it just to get some help with COLORS. I would ask to anyone with good taste and a bit of time. I respect all professionals but, honestly, I don't believe that my innocent question and the OPINIONS that I kindly received will kill your good and recognized work and investment. So, yes, this is the wrong post to have this discussion. I didn't ask for someone to 'decorate' my leaving room!

I think blues and oranges would look great in your space.

Elisabete If I were you I would open new discussion. Your room has a great potential, please keep us posted if you make any changes.

Now, back to the help! Thank you very, very much :)
I feel less desperate, now.

Darzy you really nailed it on the first photo! I felt that everything was possible and with the colors I like!

Carolins, I don't have artwork yet. So I think I will go for your second advice!

Sondramartina, so kind of you! Hope I will create something nice to show you all! Best wishes guys

Sondramartina's first photo she posted is a nice example of a very neutral room that you can add any colour to that you like.

You would want something bright to go with the natural light. My bedroom has tons of natural light and brightened it with this nice yellow color.

Elizabete, Darzy is the bomb. Great eye and listening skills. Follow her lead and you'll be in love with your living space....

Gee thanks m3459!

You have a great neutral background to work with! I love Darzy's photo and how she listened to your wish list of colors...be sure to study that!! Also, have fun playing on houzz and saving photos that appeal to you and your space...I think with the proper rugs, art, pillows. accent pieces and window treatment that this space will be fantastic! Also, play a bit with furniture placement (doesn't look like you have room for the coffee table) Can't wait to see what you do with this room!

Dslotboom I can not believe you found that resume !!!
LOL

Elisabete, your question is so wide open that it is hard for a Pro to answer, as I would have so many questions for you to narrow down and eventually support your choice rather than impose my own. Still, I think you have lots of input to choose from in this thread. Consider how the light hits the room at different times of day, what tonal value or hue in a given colour lightens your spirit or weighs you down, favourite articles that might guid a colours selection, etc. Issues such as your intended plan to keep or sell a property, tolerance for sticking with a design or love for "changing it up" also come into play and guide whether the colour you seek comes through decorative items or is made more permanent. Have fun figuring it all out---Ideabooks are an inspiration on Houzz!

Elisabete, I think your room would benefit from removing the dark blinds and going with a white faux-wood blind or white sheer curtain. The room appears dark and gloomy to me, and if your peruse the ideabooks you will notice that most of the modern designs are light and airy, with as much natural light as possible.

I just looked at your photos again and realized the blinds were outside the windows. Are you located in Europe, or the Middle East? I know they use those outside blinds a lot where there are sandstorms, so therefore my question. I think they also use them in the Islands, where hurricanes can damage windows.

In any case, I would try to use light fabrics and rugs to lighten up the "mood," and save the bright colors for artwork and accessories such as throw pillows, vases, etc.

Take your room colours from a rug you love. Go shopping and take your room and couch measurements with you.

@bsellers1394. Thank you! You noticed. :)

Darzy conducts herself like a professional all the time. She shares good ideas, makes good recommendations and is always, always pleasant and complimentary to other houzers. Gal is a winner, IMO.

And, she doesn’t have PRO under her picture. Holy Cow!

iamjudy... back at you! I always love your ideas (better than mine, my dear!) and I think you're a real pro!

Thank you all for your time! I'm trying to see as much as possible (ideabooks, stores, blogs, etc) to get inspired and to place myself and my own tastes. And I'm trying to figure out some unusual stores where I can find nice things. I'm tired of the most common ones, where I'm from. Too expensive or poor personality. The sale season is arriving and hope I'll get lucky!

Nancy Walton, I'm from Europe. No hurricanes or sandstorms, just old habits :)

Elisabete, you may find this an inspiring website. I'm in Europe too :-)
http://www.remodelista.com/

And check out eBay or whatever website there is in your country for second hand items (and new), second hand shops... to find characterful original things.

I remember those blinds on the outside :) and offcourse i would not remove them since they can be just "rolled up". My uncle had them and after huge hail storm his windows were intact,only blinds were full of holes .