Loving the piece, work on water is splendid! Also the colour variations in the desaturated yellow-green on the vests and the colours on the tank.
If I am to nitpick something I would say that the right shoulderpad on the central miniature looks a bit unnatural, I mean it's position, IMHO it should rotate backwards a little bit more as to my taste it looks a bit strange now. Not sure if I am expressing it correctly so I hope you'll understand what I mean, anyway I fear I am too late to point out this little detail. It may also be the point from which the picture was taken..... ;_(