As I got farther and farther along in the series I did less and less preparation. I didn't use outlines or sketches. I just had a vague idea of what I wanted to tell and then the dialogue just came to me as I was inking the page. ↗
I've often wished when I started a book I knew what was going to happen. I talked to writers who write 80-page outlines, and I'm just in awe of that. ↗