What a crazy old man!

For lack of a better word, this portrait is unique beyond all else. For starters, the facial expression of the subject, a 48 year old man, is just pricelessly juvenile. Also, I think that it is rather interesting how the lighting from the flash reflected off of the glass door behind him, giving him a very unique angle of lighting. Not only did the light hit him on both sides, but it made shadows in the background that draw your attention in towards the foreground and middle-ground. To add on to that, because the subject was in motion at the time of the picture his hand and head are blurred: just enough to give the picture a little bit of an artistic touch. And what’s more is that this was a spontaneous picture, not a prompted one. However now that I look back on this, I wonder if I could have used a better angle for the portrait, are there any other suggestions that any of you could make?
http://www.flickr.com/photos/mlandress2013/5368669595/