its a cool design
Nice interpretation but theres a few things keeping it from being an awesome image. first is the shading - never use dodge/burn. it looks really tacky and is the easy way out. instead, pick a shade of grey, alter the transparency, and shade with that on a seperate layer over your 'base' colours but under your lineart.
Secondly is anatomy - his hand's facing the wrong way around lol. I love the suit design, but the way the suit actually falls on the body looks un-natural and really flat i guess. Best thing to due? Look at models posing in suits. See how they fall on the body and how they wrap around the frame.
His posture, as well, is really un-natural and looks awkward. Notice how his legs are just spread apart for no real reason, and his left shoulder is just...sort of...stuck up in midair. Keep modifying your original sketch to be as natural as possible.
the hair's another problem - its been coloured/drawn/shaded in a totally different way to the rest of the pic, making it look tacked on.
on to the good bits - the spiked, jester-like collar is a fucking awesome touch, the face is spot on, and the bauble-bomb things are pretty fucking cool too
hope this advice helps man, lookin forward to seeing some new stuff