Excellent pose with full downstroke, slight angle towards us. In a perfect world I wish there was a bit more detail in the bg to give a greater sense of depth.
Nice pose and bird placement, Karl. I agree with Bret that given the high contrast/dynamic range in this scene, you did a nice job getting details from the darks without blowing out the light bg.
And I'll disagree with Miguel - single winged flight shots just look awkward to me :) I like seeing the far wing. This purely boils down to personal preference.
Your getting pretty good at duck flight shots Karl. Another good shot of a not to often photographed duck. I like the detail, wing position and the HA. I might try a little saturation boost to make it pop a bit more, it might of-set the bland BG a bit.
Nice work.