1 and 4 look like different parts of the ocean seen from a plane. 2 looks like a swimming pool. 3 I would pass up if I had the others to choose from.

Maybe it's my computer, but I think one and four complement each other perfectly.

1 & 4 go together and 2 & 3 go together color tone-wise. They all look very realistic and I would use any of them.

I like No 4..

1 and 4

I like 1 and 3 or 2 and 4... they just have the same color tone, but I like the ones that have light swirling on them the best

2 & 4 look like swimming pools and 1 & 3 more like ocean.

Same here.

All of them are great depictions of water. If they were being used together, I'd go 2+3 or 1+4.

1+3 are more like larger bodies of water, rippling.
2+4 are more what I think of as smaller areas, particularly man-made pools and the like. Also, shallow areas, not necessarily man made.

Of course, all JIMHO!

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