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You're off to a nice start! One of the keys, to me, in using one light/OCF like this is to try to match the ambient light as much as possible, or the opposite side from your flash gets lost in the darkness, as what has happened here. Doesn't mean it's bad, just not my style. I would have kicked up the ISO, slowed down the shutter speed, and got more light in on his dark side. Of course, a second light could do that, or a reflector, but I don't think you had either of those options. Just my thoughts. Like I said, this is a really nice 1-light OCF shot, and you're off to a great start.