what does "had some potential."here mean?
“If you have something you don’t want me to see—such as that fab-ulous sketch of Mermaid Me, which I’d love if you replicated on good paper so I could have it—you need to put it away. I have a key, and I intend to keep using it. I was looking around for you.”
“Okay.” He did feel a little weird about the sketch. “Sometimes doo-dling helps me think.”
“That wasn’t doodling, it was drawing. Doodling’s what I do, and it looks like half-ass balloon animals. I liked Devil Vampire Wolfe, too.”
“That one had some potential.”
“I thought so, and drawing did help you think. The cast of charac-ters, the connections between them, or among them, the timelines and factors, all there, all logical. That all seems like a good start. I think I’m going to make notes of my own.”