hello, honestly this art of pinkie is super fucking adorable!! That being said i would like to point out some things.
number one. next time i would not add the bottom eye lashes that's kind of weird and looks "off" though i will admit that's more anatomically correct but there fucking magical ponies it doesn't matter of they look "normal".
number two. There are a few "dots" mainly the one on her tail, that bother me. I'm sure that's not preventable though, sorry.
all in all AMAZING art work and i love all your work, thanks for making them.
Your line art and style are fantastic, as always, very clean. But if you want errors pointed out on this drawing specifically, here's the things that bother me personally.
The only things that seem off is her front left hoof and her right eye. Her right eye should be just a wee bit more to the center and looking up a bit as well. And as for her front left hoof, it should be less thick.
I like the "fluff" you add in their ears, a lot, its just adorable. The way you draw the characters manes is really good too, especially Rarity's.