So yes, I am an official My Little Pony cover artist for IDW Publishing. You can find my retail incentive covers as the following

Issue 21 Fluttershy
Issue 28 Pinkie Pie
Issue 32 Cutie Mark Crusaders
Issue 36 Twilight Sparkle Rarity
Issue 38 Princesses
And most likely issue 43?

You can still find most of them online or buy some from me as well.