If this boy had been dressed in clothes fitting the robin hood theme, and the shot had been either cropped in closer focusing on his expresson, or cropped wider showing the whole boy and bow, I think this could have been a winner. What a determined mischievious expression and great hair for the robin hood theme as well. Oh, I also would have edited out the vine or limb that is running parallel with the bow in the upper right. It is a little distracting.
My first thought when I opened the thumbnail was its all in the way you hold your tongue. Great DOF. Incidently, I would not reccommend standing in front of an archer to get a good photograph especially the way he is holding that string back.
Boy, Robin Hood sure has gotten modern! :) I like the POV, and the look of concentration. Would have been nice if you could have found more "earthy" tones for the boy to wear, as it would have sold the "Robin Hood" theme a touch better.
However, it's still a pretty good photograph.