OK. First, kudos for the size and the action.
I have to ask, did you want the four-panel for a specific reason or was it just to show all your work together?
I like each of these separately - they kind of work together color-wise and your top panels look like waves and with the bottom action, looks like swimmers are in an ocean. Only thing is the waves are crashing against each other (turn 'em into trees?)
I like your pink to reddish SOS colors for your swimmers
and the (boat, jetski, ...?