I have the cover for the next book in the Sorcery and Scholarships series:
It wasn't quite what I was thinking, but I'm actually fairly pleased with the stark contrast between the background and the eponymous rainbow. It fits the book in a lot of ways.
There are still a number of minor issues I need to clear out before publishing the third book, but to be honest the biggest issue is the editing. Unlike the previous books, I'm not sure this one is as polished as it needs to be. Publishing it too near Christmas and New Years also strikes me as a bad idea, given how big a deal those holidays are for most of the world. We'll have to see how this goes.