AirStyle, thanks. I've moved the head one pixel up and one forward. The left side of the chest got merged with arm. Guess I should make it more readable.
Overall, the skeleton looks pretty good, but skeletons actually have rather long necks than what is usually seen on a skinned one. So a little of the neck would appear. Currently, it looks like his head is pushed into the rib cage.
Also the left side, or HIS left side, of the rib cage doesn't seem to be turned like the rest of the body. It kind looks like it's facing forward. Maybe if you can shave a little off that side?
nice