in all honesty, i think the original child's face was the best, it was the most effective of all of them. the style is clear and easy to read, something all of the others, though perhaps more artistically realized, lack entirely.
as for the hoplite, i think if you didnt dither it it would present much better, the dither only serves to obscure and rough up the forms rather than smooth them. the post is fine though. i do have one question about the subject though; why on earth give a hoplite a halberd? it's about 2000 years out of place (halberds belonging not to the medieval period, but to the northern renaissance period and later wars, primarily in the german states).
