I actually have a photo of a Corythosaurus mummy that, instead of having the serrated frill as you have drawn, actually has a smooth skin frill running along its spine. Overall this is a fantastic illustration and I really enjoy the beefy-ness of the animals; more along the lines of the hadrosaur mummies. If you were interested in the photo just let me know and I'd be happy to help.
Dang-- I think I've seen that photo, and I knew that the Lambeosaurine hadrosaurs had the continuous frill, but for some reason I was thinking of the Brachylophosaur mummy's serrated frill when I drew it. The dangers of not doing your homework carefully. Will have to go and revise. Thanks for the nice comments!