You seem to have had fun with these guys Charles. Nice sharp flight action with water droplets adding to the action. Great detail in the whites and good eye contact. There seems to be a slight magenta cast.
+1 on the above comments - really nice image all-around. Excellent detail and exposure, the latter not that easy on terns, which have both deep blacks and whites. Not so sure about the vertical crop though, since the bird is moving horizontally.
Thanks for comments. My thoughts on vertical crop---it put the bird larger in the frame and created a diagonal from the tip of the wing through the body and image which I liked.
The original pic as you surmised was a horizontal.