There are mirror twins, Hatsune Miku and so on. . . Anyway, this is not an anime, just a fan.
But if you like this style of painting, I recommend you to see Pisces, which I think is quite similar to your painting.
As for the Pishi constellation, there are 12 harem films of a leading actor and a leading actress. . Very good.
Again, this picture is just a fan.