So saying, I'm sorry for this critique; not on the art at all, actually, but the title. I worked as a grocery clerk for 5 years. Pink Lady is a type of apple. Which brings to mind, "Is she suggesting that our hyper-active friend here is related to easy-going Big Macintosh?" If so, that would be hilarious!
And the fact that you understood that this was about My Little Pony withOUT me mentioning ponies ANYWHERE in the description means YOU'RE A CLOSET BRONY TOO!!! THAT'S RIGHT, I'M CALLING YOU OUT SIR!!!!! >
Ooh, a party girl Pinkie! I think that toning her zaniness down for human version makes sense; we can accept a lot more wackiness from a pastel-colored cartoon pony than a human character, even if she's a cartoon girl.