And will be appearing in the upcoming MLP art book, The Art of Equestria!I initially sketched this one in Photoshop, with the aid of the canvas rotation tool; then I brought it into Illustrator, which has no such option, ugh. ~_~ So it was vectored in quadrants with each section rotated upright, then combined.Rarity is enhancing the fabulosity of Tiberius, Luna's pet possum in the comics. Derpy is "bucking bolts" - in reference to Amy Keating Rogers' early script version of The Last Roundup.