Oh my gosh, she's so cute like this!
Very nice artwork. I like it.
Of course, with this crossover, I can't help but picture:
Celestia as Zelda
Woona (filly Luna) as imp-form Midna
Luna (from Nightmare Night) as Midna normal form
Nightmare Moon as Midna using the masks
Sombra as Zant
Discord as Ganondorf
One of the Mane 6 as Link, the others as the other children from Ordon
...and so on and so on.