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In my opinion, the boldest effort is the first, but to me the face is a bit underexposed. This approach is a matter of inches; note the sides of his nose are illuminated by the two kickers, which is not what you want. A bit more light on the face would have made this a real winner. I do like the light on the hands. If you check out David Hobby's strobist.com website today, you'll see a remarkably similar composition, with more light on the face. In the second and third shots, the fact that he's looking off camera makes him appear kinda furtive. To me, the best shot is number four, followed closely by the classroom shot you posted separately.