I absolutely love this piece, beautifull imagery, and skillfully executed.
Some points of critique concerning the hands though;
his left wrist could maybe use some more definition (im not an expert on anatomy, but it looks a bit swollen to me at the moment)
His right hand seems to have two thumbs..?
The "black" areas could be a bit more evenly colored (or rather, in the same direction). there are some areas where its almost about to get messy.