I think it would be ever more 'decisive' if both birds were in the same position , but , well you can't control nature so I'll spare you on that : Overall I like the shot.

I've rated this low on relevance because I can't see the decisive moment here. I guess you could say the gull is about to unfurl it's wings - or that there might be a big wave coming to knock them off ... but to my eyes neither of those are present.

That said it's well composed and the colours are beautiful!

I'm not sure I understand what the decisive moment is here?

This is an interesting image. I like the line formed by the pilings and the complementary poses of the two gulls.

The top bird looks like he's ready to take off. I'm guessing that may be the decisive moment. It's hard to tell from here. The colors are sharp and the focus is wonderful. This is a beautiful shot.

Composition is good, but relevancy to the theme and impact are not there for me.