I really like the expressions, but what makes this for me is that you have a character with a bad intent looking to the left from the right. It reminds me of the old Hitchcock films, good-willed characters look to the right side of the screen and ill-willed characters look to the left.
I wish I were an artist so I can give you a special critique about this. I know nothing about design or painting, but I think your pictures are great, the expressions are so real and "expressive" (if you'll forgive the repetition).
those guys/clothes remind me of some character from an anime...digimon i think it was?
anyway, awsome drawing!