Background Pony #1AF1
I don’t know if it is 100% (I joined the fandom after tumblr got nuked) but I have seen collections of Moonstruck around on other sites.
By any chance, does anyone remember the name of the Rarity-looking seapony? Sadly much of Scootaloo the Adventurer was never archived and the tumblr is gone now and no other pictures of her ever made it here. I seem to recall that she just looks like Rarity and Sweetie Belle initially mistook her for Rarity, but I think I remember something about her not being Rarity.