I like the slight fuzziness of this, since it puts the focus all the more on his eyes, which are nice and sharp. Really like the toning, too. And what an adorable young man! Very nice portrait.
The focus on this bothered me a bit, so I gave it a 6. The eyes are nice and sharp and bright. I like the dirt because it looks genuine, whereas almost all other dirty face entries were contrived. It's fun to see your son -- he's very cute, even when not feeling well.
I'm surprised this didn't do a little better - not enough dirt for the voters, is my guess. The lighting is nice but the focus could be a bit sharper IMO. Your son is adorable, by the way!