Nice work.
I'm not super familiar with the show but I happened to look up some source images while making this review, and I think you captured the style well.
I very much enjoy the pose you chose. If this wasn't a cartoon I would be inclined to think you modeled it based on a real violinist.
The colors work well in this piece and the violin is by far my favorite part (Good Attention to Detail)
The only nitpicks I have are with some of the highlight placement choices.
Considering his placement in relation to your light source. The hair and darker parts of the suit are almost completely lost in darkness of the background.
Also one last thing is the skeleton itself. Compared to the violin it seems lacking in detail, but that may just be due to the style you were going for. If that is the case ignore this last comment it's basically just my own personal observation