I’ll admit right off the bat that I’m not an illustrator. I have no drawing or painting talent whatsoever (aside from stick figure cartoons that my kids find mildly amusing). But one thing I’m somewhat good at is digital remixing of other people’s art.
For quick book cover mock-ups, I like to work on my phone. It’s convenient and I can fiddle with ideas anywhere, anytime. Here’s a quick rundown of the apps I generally use.