I did a book about a year ago for an independent author. It was a 32 full color book which she then published on blurb. I really wanted the job so I quoted her $2000. $500 for sketches/roughs... $500 for inked... and then $1000 when colored. This way at each stage of the process i was getting paid. But she was somewhat difficult and picking cause she wanted it her way and the pages stopped flowing well. Then I added her story into it and it really was not good. I do not share it cause I am not proud of what it became. She was extremely proud of it and loves it, but lesson learned I should have charged more.
With that I am working on my own personal book that my son wrote the story. It has been about a year in the making, and hope to finish by years end.