It looks awesome, I can't really think of anything I'd like to change except maybe have her wear a crown or something. Sorry I forgot to say something about that!
Yui from Angel Beats! reminds me of Pinkie Pie, not just because of the pink hair, but they're both very loud and adorable.
Oh, and America from Hetalia acts like Rd, they both believe they are the best person/ pony ever
I'd like to request a signature please! You're work is awesome!
Ponies: Alicorn Derpy
Text: "Princess Derpy" and maybe "MUFFIN!"
Background: Whatever might look good, I can't figure it out.
Other: I'd like a muffin on it somewhere
If you need more specifics, just ask!
Let's see, favorite anime, In no particular order
Angel Beats!
Soul Eater
Lucky Star
Death Note
Black Butler
Baka and Test
To name a few
And as for manga, I've only read a few but I like Blue Exorcist, Death Note and OHSHC.