And he walks

[Amit Dutta]

I wouldn't really call this a landscape mate. but I think in general the comp is nice enough, but I think as you only have two separate layers, a transition between the various levels of depth might help. Not sure how you would add it into this comp, except in the small amount of space in the left of the canvas. I think as this is more an illustration, perhaps coming up with some thumbs for different perspectives would be best to give you a better direction.
In terms of texture, I would suggest using more reference for stone texure to get a more realisitic feel to the texture and reflective properties of stone.

Hope that helps