Getting nitpicky again (this is, after all the Finished Work forum
Lighting is much better. More depth to the scene.
The bump map on the walls is too strong. Tone it down a bit to look more natural.
Somehow, the character and the skull look like they're floating a bit off the ground. It may be that the models are actually on the ground, but the way the lighting and the shadows fall there, it looks like they're floating.
The jug in the lower right hand corner draws too much attention to itself. Part of it is the brightness of the hilites, part of it is its position in the frame. Reducing the brightness on the jug will help it recede a bit more. Possibly repositioning it further back in the image might help too.
The shackles and chains are too shiny. They look brand new. Doesn't seem right for this type of scene.
You're almost there...