Haven't read your progress in SZ, but I the result is pretty nice! The whole setting is original and decently worked out. Greytones and lightfall are done perfectly, the only minor things I want to comment is the integration of the characters in the picture, which is ofcourse a very hard job, but you can see a little difference in sharpness between the characters and the objects they're next to/behind. In a real photo you'll never see this. Another negative point imo is the text; the choice for a 'flat' text doesn't really match the 3D image, the font is a bit too 'busy' so it drags away attention from the wall. You might have chosen for a smaller, simple, shadowed text.

Anyway, you did a good job, keep up the good work and have fun.