This is what I meant when I described cropping your middle Sanderling image. It makes more of the procession, I think, puts them on a level bit of ground and eliminates the uninteresting white foreground.
Also, a general comment and pertinent to these; sometimes your images seem to lack contrast "punch". Is this deliberate or do you think they have enough?
What do you think of my crop?
Original:

Cropped:

Ivan