The drawing style is pretty good. (Some people mistake a simple style for an advanced one that's sloppy. I don't know if you draw skeletons for your figures or not, but you should look into proportions and figure drawing if you want to hone your craft.)
Only two things that are against my personal preference: the water, and his skin (which I feel should be a tone or two darker.) This doesn't detract from the piece, that's just what I'd do differently if I were to replicate it.