Hey there man, this is the first of your pictures I've come across and it totally blew my mind. You are very good, I love Frank Millar's characters and Batman. Was there a comic crossover this was from or did you just get given the idea? Either way you've captured these characters well. The proportions, the postures, everything. A definate favorite.
Someone somewhere has already done this for a fanfic, though nowhere near as cool as you. There's another Hellboy movie?!! JK, I just saw the trailer on youtube, looks fantastic. Are vampires involved? ('cause there's iron in blood and it's called HB:Blood and Iron....)
Out of all three, I'd have to say Abe looks the best (put 'em up!), then Hellboy (freckles?). (The)Batman, however, looks kind of odd with his very undefined face (I'd liken it to Usagi Yojimbo characters seen from a distance: the face is just two long lines and a short one for a mouth), which is strange considering he's in the foreground. Since this is a commission I'll just assume this is something the person requested; it's a very nice poster nonetheless!
Hellboy and Batman are my favourites north-american comic characters, is really cool seeing them in the same picture (well, sometime ago I read that Batman-Hellboy-Starman comic, good art by Mignola, but I didn't like much the story) . Abe is amazing too, he looks very young here.
Excuse me if is not a good question but, do you have any relation with the Hellboy animated movie?