Nice series. I like the exposure you chose in the first, to really get the texture of the wet sand. The placement of the footprints isn't what I'd choose (I would probably have put them in the lower left portion of the shot,perhaps at an angle or offset), but that's just personal taste. The second one is gorgeous, with all those shades of blue in the sky and water, and I like how you composed it with the white of the sand and waves placed on the diagonal in one corner. Including the swimmer really gives it scale. The fourth one is a pretty sunset shot. And in the fifth one, I like the way the above and below water portions of the dolphin makes for an 'abstract outline', in that pretty blue water. Good sharp detail in the dolphin's snout too.