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#1 says nothing of what he does; it's also overexposed.
#3 is the most dynamic and best of the bunch, but if it's going to be printed, framed, and delivered as a gift, his expression's a little too serious for that.
If only he had #4's smile in #3. #4 still doesn't say anything of what he does.
#2, though too posed, is probably a great combination of "environment" and "who he is."
Great looking pics overall.