The dark blues immediately drew my eye to the thumbnail when I first saw it. I think that this is a good wall, but it could become even better if a bit more attention was done to the realism of the lighting. From what I can tell, the lighting is coming from the one window/set of windows behind the character (also, from the perspective, slightly further into the background than the black wall with the title on it). If this is the case, then it seems to me that the darker shadings on the character should be placed to the left side rather than the right side. Anyways, realism aside, the effects (dark versus light to emphasize structures, etc) of the lighting are most certainly well done.

Onto the title; I have no problem with it being placed right where it is, but I think it would be cool if it wasn't quite so hard to read; that is, brighten it up just a bit.

Overall the effect the wall has is quite pleasing, congrats! Keep up the good work.