Overall their nice, but not wow. Not saying they are bad at all, but like Maxwell Smart says, they 'missed it by that much'. Here are my nits/suggestions;
#1 - Clone out the little beach chair; see if you can warp the lifeguard stand to be straighter; add in a little bit of sun reflection into the water or lighten it up (water looks too dark/boring)
#2 - The out of level doesn't bother me as much as the horizon being dead center. I'd crop at the bottom, to just below the weed's reflection, as the lower stuff in the water is distracting a bit. Also see how it looks with a little of the left cropped, or maybe the right. I think cropping off the right to closer to the weed might look a tad better. But that said, it's actually my favorite of the three.
#3 - While the colors are wondrous for being sooc, the blown out sun really looks (IMO) bad. It's too blown to be appealing. I'd again crop some off the right (maybe to the left of that little peak?) to get your folks closer to the right 3rd of the frame. I think because they are silhouetted, and they're leaning against each other, that's enough to make one (me at least) envision they have an arm around each other, so I'm ok with the 'pose'.
Good work overall though!