I like to think that this is what luna looked like in her teen years. I also like to think that the reason she looked young is because due to her conversion to nightmare moon and back, it threw her powers and longivity out of whack, Which was only temporary. Finally, I like to think this is what her hair looks like when she doesn't use conditioner.
This is a beautiful picture, and I'm impressed by how well done the background is, and I really enjoy how it looks like she's walking away from the sunset. It really makes it seem like she's leaving her sisters domain and entering hers.