Great shot, I love the mischievousness you've captured here ... very "boy". :)
When I read your title, "be ashamed", the first thought that popped into my head was "of what?" ... the only thing about this image that I could possibly consider shameful is the fact that I live in a society where the photo might be considered pornographic.
From a compositional standpoint, I personally would prefer to see a little less dead space on the right ... I'd crop it a bit tighter. Note, however, that that is just me, and I'm a square format bigot ...
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