Before I say anything.... I must confess when I saw this pic for the first time, I thought I must had taken LSD... but then... I couldn't stop laughing, because I love this picture so much ^^
So, this is the first time I see... a pony as a carrot and this idea is really funny. Not much to say about the charater itself, it's just Pinkie Pie and nothing besides. Even now, I'm just staring at the character and cannot come up with something concrete. But to be honest... if it was an experiment, it's decisively a success.