I stumbled across a new technique, although I'm guessing someone somewhere figured it out before I did. However, I've never seen this done before so I'm claiming it as my own. It's very, very difficult...NOT! Let me show you the card and then I'll explain.
I colored with Copics on the front side then turned my hearts over. I was getting ready to stick them down when I suddenly thought, "I like this side better." See, told you it was terribly difficult!