Not that I care to get mixed up in all the DArama going on here, but the artist called the picture "Summer vacation" which - unless things changed in Japan since the last time I was there - is something exclusively school-related.
I don't see why everyone thinks the artist is a pedophile for drawing this and that it needs a mature filter. Sure, one of the girl's poses is a bit suggestive and you can kinda see that area, but other than that, I think it's relatively innocent. It's just two girls with their feet dangling in the water. A decent amount of skin is covered up; it's not like those parts are actually exposed, or they have watermelonboobs, or anything like that. As for the pedo part...drawing a couple of younger girls in swimsuits doesn't make a person a pedophile. I have an OC who's ten and wears a short-ish dress, and an OC who's twelve and who I like to draw in short skirts and other girly things just for the heck of it; does that make me a pedophile?
Anyway, all that said, I think this is really cute. My only crit would be that the girl in the white swimsuit looks like she has a...*ahem*...the male part, but other than that, I love the coloring and the anatomy and the way you did the water! Congratulations on the DD.