First of all, I don't think that furniture is comfortable enough to sit and watch TV, so the TV should be remove from that room, the purple wall paper and the purple furniture is too much, you should consider another color for that wall and the furniture against the wall it doesn't look good. What is that room at the end is kind of dark and I cannot appreciate exactly what is the purpose of that room. I'm a firm believer in skylights, we have skylights in the laundry room, kitchen, living room and office, they make a big difference. (if you cannot have skylights (or tube lights) can lights are a great option. There are a lot of great ideas from everyone. I can't wait to see the after photos.

How high is your ceiling if only 8' I would not put in false ceiling. This is a small space for all you want in it so I would keep it very simple.These pics are form a LR and DR in a 11' x25' space and we had 9 1/2 ' ceilings so we put in crown molding but that was all. In your case i would put the T.V where we had an empty fireplace space.

I agree with painting the doors. All my interior doors are a deep charcoal grey. You'd be surprised how expensive it makes them look. That aside I would start with a rug. A huge rug. Something chic with a lot of color. Then add love seats in white, colorful pillows, and chairs in fabrics that pickup the colors in your rug. No BIG furniture. Just because you have a big room doesn't mean you need to stick a brown sectional in it. A couple fancy topiary would look great under those windows. And dont forget lighting.

Rishab, How were they installed? Most likely, you will have to call in professionals.