Neat "alarmed" pose. Looks like you had harsh light to deal with, making for a quite contrasty image. I would remove the blue cast on the bird's face...and speaking of blues, they look oversaturated too. Yes, they do have a large head releative to body size!
Pied-billed Grebes look like this when they are giving their call/song. There's some head movement involved so you need a high SS to stop the action, which I think you have done here Steve, more or less (there's a hint of movement in the face and bill). Love the liquid-gold/silver water.