the lamp makes no sense to me. it would not have been designed to be half in and half out.

I think the lamp needs more of a bump map on it. you could even just move a few verts to make it look not so CG. (its too smooth and perfect.) give it a few dents.

the shadows as were mentioned need to be softer. having them sharp for contrast doesn't make as much sense as having the textures provide contrast. anyway, I thought you were lighting this with IBL? ...it will help your glass look like glass.