Looks like someone's OC..that i don't know.
why is their mane are so fun yet so hard to color? but everytime i color them i get colorgasm.
Celestia and Luna at the top [link]
Celestia and Luna at the bottom [link]
(though they could be the two Princesses parents, but that's not in my headcanon and i don't like the idea of them having parents/grandparents or whatever) besides, Celestia looks pretty good with aqua/light blue mane(but with her normal eye color).