Cheers, dude, good stuff you've got here.
Certainly anatomically there's little to find issue with, damn fine overall in every sense of the phrase.
I'd like to see more compositional work, though - your characters hit the mark, but I'd like to see them interacting or within a 3-dimensional space, and all the value challenges that brings. Honestly that's about as close to critique as I can really get with you, man, idle suggestions for content.
I'd like to see more, though, hope you keep posting! And submit 4 pieces to the Art Portal, you can't get scouted until that happens.