Cover Characteristics: Book Covers featuring Faces

I know a lot of people don't like book covers with faces, but sometimes they're done really well and are really beautiful or striking. I especially love illustrated ones because it gives me the chance to see the character exactly as they're meant to look and to connect with them before I even start the story, plus I'm a sucker for pretty artwork. Even photos can be great if it's not a photo I've...
 

Cover Characteristics: Book Covers featuring Butterflies

So, butterflies. While not the most difficult topic, you wouldn't think butterflies would be that common on book covers, right? Right?! WRONG. SO RIDICULOUSLY WRONG. I started out well, I knew of a few off the top of my head and found some more on Amazon until I had some nice ones to choose from. But then I had this brilliant idea and was all, "I'll look through my kindle library and my TBR for...