I'd say the DOF is too shallow here... not only is part of his head going soft, but as his back is turned significantly towards the camera he's almost walling off the background. There's no closer foreground before the focused area to lead the eye in, and too little behind him to carry the eye on towards the background. The result is that he looks pasted on. Connecting him more to the monks on the left by using a smaller aperture (or e.g. shooting from further away and cropping) and a slight move to the right would have helped.
I like the general expression you've captured - the humble, gently expectant upturn of the head and open mouth.
It's also noteworth that the row of people in the background are chopped off about the shoulder-line. That's quite a provocative and disturbing thing to do.
The white mats are also a bit too dominant - might burn them down a bit if you want to make the most of the image.
Cheers,
Tony