In your tile choices we had picked the one on the right as an option when I was trying to pick a 6x6. We went to our friend’s pool and they had it. Right there I decided against it because I didn’t want the same as them. It looked good though. Kind of reminded me of denim. One thing I will say, if you go with it and have any kind of raised wall, make sure they mix up the pieces and flip them to mix up the pattern. They had a section on they spa that has way too many of the same pattern together.
Do you have to pick them all now or can you take your time and research? For plaster, see if your builder has any pools you can go look at. That little square will look nothing like that in your pool. I can tell by your photo that the lighting is changing the colors because I know what color that one tile is. But you need to decide what kind of water color you want, not just what plaster color you want. Study pictures so you can kind of get an idea of what plaster will make what kind of water color. WetEdge has some videos on water color. These things are so hard. I’m trying to decide if I want the texture I want or the color. If I get the texture I want it will be a white based quartz. If I want the color it will be a mini pebble. We’re doing o/b so I have some time to figure it out since we are digging next week. I’m sure it will be a last minute decision.