I love the way Darters (Anhinga) just sink rather than duck dive to go hunting.
A bit of a challenge to anticipate when they start and to follow them down, it all happens quickly.
It's taken a while to get a shot that I am not unhappy with, could have done with better light than the early morning sun.
1DXIII 600 f4 III 1.4x III 840mm HH
1/2500 f6.3 iso2000 +0.7ev
Not too much PP, cropped to taste (mine at least), levels, light sharpen PS2020
I like what you were trying to d here but that orange light on the head is weird. It makes all the details look crunchy.
I think this would be a very strong and unusual image if you had better light,
Gail