Hi Steve,
This is a very interesting capture. The frog hanging out of the duck mouth makes this image in my opinion. I like the inclusion of the habitat. I agree with Axel's comments and would only add that it might be worth reconverting the image once for the whites around the eye and another one for the rest of the image. Then combine the two images in an attempt to bring bring more detail into the whites around the eye. As presented the white read 255 in photoshop and lack detail.
Again, I think this is a very cool capture. Thanks for sharing.