try using less saturated colors. the shadows aren't consistent, I assume your light source is overhead, yet the computer desk casts no shadow directly below, instead it behaves as if the light is coming from the right, at about floor level. the border around the window is a bit thick and makes it looks like a frame (window is also a peculiar shape, maybe that's common where you're from). Computer screen seems a bit short.

The cracks and spider webs are out of place. Or maybe try making them fit by adding more age to the room. as of now it doesnt look like its very old at all