I can definatly tell that you put a lot of effort into this. There are some things that could be improved. The walls shouldn't just end and go into blackness, unless you are saying you are in a room, lit up by the torches, but the way the walls are, it looks like just an extension of the hallway. The torches aren't very good. The colors are very dull, and they kinda look like paper. They should also have more effect on the room, especially if they are the only lightsource, aside from the gem of course. They should create shadows around the room. For example, considering they are behind the gem stand, the stand should cast a dark shadow infont of it. You should also consider the lighting when shading the stand, which also looks flat. And lastly, the hallway behind him should just have the floor showing, the walls should be the same shade as the floor, which should get darker as they get back. Unless there is just a floating floor, and empty space for a ways around it.

Hope that helped and made sence. If you really don't want to improve this piece, then just keep in mind some of these things for next time.

It needs more shading on the walkway and walls, but its a good piece.