I've tried nearly all of them out there. The Cintiq Companion is the only one that is fully functional. You're constantly looking for workarounds and fixes for anything else.
looking great, my only critique is the eyes. In the original he's looking rite at the viewer, yours is a bit more off to the side. everything else is spot on
Coming along nicely, definitely a lot of improvement from the starting piece. Are you going to be adding anything else to those walls to make it more interesting?
Just wanted to close this for anybody else that had a question about this. The below pics are a before and after using Photoshop's layer -> Matting/Remove black matte.