Wow. He's got a bit of a sinister look ;) A little more parallel to the head would have gotten the tip of the bill in focus, but that is really minor. The colors in the water and the plumage are great.
Very cool! I would only fix the reflection in the eye...there is a dark spot right next to the pupil that competes with it (and the pupil itself could go a bit darker).
Good advice as usual! :D I'll be thinking of you and Al tonight... green water and glass is the target... Hopefully a Loon family decides to join us. ;)
Excellent details in this close up - especially the eye & around. Might agree with Fabs with regards to slightly increased DOF to get the tip of the beak sharp too.