Gosh, it's gorgeous. I love black and white art so much and this piece is amazing. The details are stunning. I keep looking at things like the pattern in the rug, the frame of the picture and the top of the table. Lucius looks ecstatic and his daydream is very hot!
(As for Photoshop, that can be so exasperating! I was wondering if, perhaps, you tried creating a wall-paper here with some kind of structure to it - perhaps via some of the custom stuff in PS - that it would blend better with your drawings. But I admit that's guessing on my part ;-) )