First off, wonderful vector. Personally my favorite of Derpy. Second, I'd like to ask if I could use this vector on a poster for my college's MLP Club? Of curse we'd credit you on the poster, but I'm not sure if you would consider it commercial.
Nope, no profit! Just Bronies. xD All we'r using them for is to advertise the club, so if we do use it, I'll be sure to give you full credit on the front of the poster. I'll also upload the final poster and link back to you. Thanks! ^^