It has that cartoon feeling
The way you portrayed him with teeth standing up and a wave make your work have that friendly feeling. The colors are pretty basic, with some simple shading and highlights. The background is barren with a few curly trees(?)
I can tell that the mood for this is dark humor, because something, just doesn't seem right about it...
To improve, I would suggest you made his bandolier belt a bit more standing out with shading. Other then that, Nice work, it looks great.