Have you ever been purely an artist on a book, or do you only draw your own works?

I have a couple times, but the only major one I was happy with was working on Empowered with Adam Warren.(although it printed too dark- I think it’ll look better in the trade) Poor Adam had to deal with me being a fan of his since I was like 14. 

(here’s me at 16 with one of his Dirty pair books)