I think you can start by de cluttering. There's too much going on. If you want to keep the bedspread, I would pull some colors from that. :) Teals, browns, whites. It would make a pretty room.

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.

Ferns usually prefer moist humid air with dappled light. Not strong sunlight and certainly not air conditioning.

In high humidity, I suspect fungus but it could easily also be some kind of sucking insect. Try swabbing the plant, especially the underside of the leaves, with methylated spirits. Also spray with fungicide. By the way, don't want to say this, but in the West the word 'swastika' doesn't have good connotations. I know the meaning is totally different in the east, but using that as your avatar name might not encourage people to help.