I think it works pretty well as it is now. There is something very sparse and clinical about the background, which suits its purpose well. The style doesn't warrant a more elaborate shading or texture, so keep it simple. However, I suggest two things;
1. Let the wall occupy more of the image and cut back on the ceiling. It's all about priorities; the ceiling takes up about a fourth of the image and it's not very interesting. However, floor typically deserves more space in ag-backgrounds, since it should make room for walking around.
2. Add some lines or tiles or whatever in ceiling and floor to create a sense of depth. There is nothing wrong with the perspective now, but there is nothing to suggest that we're looking at a room, and not a set of areas piled on eachother like a flag.
Please make a paintover and show the results.
EDIT:
Made a little edit to push you in the right direction. The modifications are sloppy, so you need to redo them yourself.
Various changes.

1. Let the wall occupy more of the image and cut back on the ceiling. It's all about priorities; the ceiling takes up about a fourth of the image and it's not very interesting. However, floor typically deserves more space in ag-backgrounds, since it should make room for walking around.
2. Add some lines or tiles or whatever in ceiling and floor to create a sense of depth. There is nothing wrong with the perspective now, but there is nothing to suggest that we're looking at a room, and not a set of areas piled on eachother like a flag.
Please make a paintover and show the results.
EDIT:
Made a little edit to push you in the right direction. The modifications are sloppy, so you need to redo them yourself.
Various changes.

