I really love the look on his face, like there is something that he just can't stop thinking about. I only wished that it wasn't so washed out, if there were just a bit more contrast between his arms/shoulders/head and the white background, just a little bit more. Otherwise, I really like the look and feel of this photo.
The white contrast adds a little but the subject is not unique enough to make him appealing. He is centered on the bench and would have prefered to have him on either end. The crop cuts off just a peice of the bench, would like to see either more of the bench cut off or have it entirely visible. Can barely make out the drink and seems placed unnaturally.
I admire your chutzpah for entering something that looks so much like a pencil drawing. I like it a lot, as it captures a very lonely feeling. I'm not sure about the composition, though.