Without knowing the dimension of your room it's hard but I would suggest the following: Colours: keep it neutral, try not to choose colours within the yellow spectrum. Although you would think it would make it feel 'warm' they also have a tendency to make it feel quite dark. The room is too small to do anything majorly bold with your walls. I would be tempted to choose a slightly off white colour and use your pictures and a big colourful rug to bring colour into the room. Orientation: put your TV in the wall above the fireplace. Your sofa under the stairs and get two smaller occasional chairs on the wall the sofa is currently on. Also put your large mirror on this wall. The armchair you have could go where the TV is and be used with the standing lamp as a little reading chair. Windows: slated wooden blinds in brilliant white would look great. Lights: change the green to match the chandelier light, the rooms not big enough for two different lamp shades. Or at the very least a different chandelier? You need small tables with lamps on dotted around. Your pictures are hung a little too high to the ceiling. You might want to try grouping them together a bit more. This is just what I would do, but It's a pretty little room, it'll look nice whatever you do.

Such an interesting room full of gorgeous pictures and books. I love books! Now colours that I think would look lovely with your blue curtains are the soft pastels - green, pink and pale yellow, but you want a deep cosy colour so let’s move on! I’m a little bit obsessed with dirty pinks at the moment, a world away from Barbie pink so don’t panic. Colours like F&B Setting Plaster or Little Greene’s Dorchester Pink, or Blush which is much darker and cosier. I also like deep stone colours such as LG Roman Plaster, or if you wanot to go even darker, Silt looks nice, very organic tones. I’ll try and find some pics. I’ve no idea how to photoshop, but I’m sure someone will!

Do you have pictures of the rest of the room including furniture? Wall colours need to reflect what you already have in the room. What style of decor do you like? I can see a tiny bit of a cream wall so it will have to go with that? My first thought is green. Overtly Olive by Dulux is nice and Laura Ashley do lots of greens in their range. Lovely paint to use too.

The heat from the gas fire builds up in the faux chimney so needs an outlet and ventilation. On mine, this is at the rear (external wall) and grills side of chimney breast - they do get hot. (The TV doesn’t). We did not want to store / display anything at the side so this was not a problem to us. Our “before” looks very similar to what you have. Possibly because of the heat maybe why there are not many images associated with gas fire tv above. If you haven’t already tried, you may find the arrangement you are looking for / ideas by searching for electric fire tv above or going on different manufactures websites. If you see something you can then find out if this is suitable for gas fire.