Let's see here
Great picture, the background (especially the water) is highly detailed, just the way i like it and the expressions are simply perfect :)
When i look further than boobs and expression though, i noticed the wings on the righternmost girl, imo, you shouldve made them stand out a bt more, the left one (to the viewer) blends too well with the sand (shady part) so its hard to notice it, and the right one is jammed away between the girl and the edge of the picture, in a darker spot of the picture, which is already hard too notice, because its a bright picture.
The towel of the blue girl looks a bit big, like she took 2 towels and put them together, I think it should be a bit smaller.
The middle girl is really shiny, like she's oiled, but that may just be your drawing style (or sun lotion).
I really loved the light effects on the belly of the middle girl, making it a bit lighter at the muscles.
Well, that's just my 2 cents, hope you like the constructive criticism. :)
It's not often that I get a nice well-observed evaluation.
I appreciate it. :)
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