I have a question for your blog. You've said before that it's really hard to do two things well. But just supposing someone is crazy enough to do both writing and illustration, how would they best seek representation? How would that work? Say this person wants to write and illustrate their own graphic novel.
Oh you mean like
Otter is of course not a graphic novel; it's a picture book but the author, Sam Garton, is also the illustrator.
And I believe Marjane Satrapi did the art for Persepolis as well as the text.
This isn't two things. Each of them are one: a graphic novel, a picture book.
And you are the author/illustrator. You can be a good author/illustrator, you can be a GREAT author/illustrator. You can be a terrific graphic novelist.
And you query for it with text about the story. It will help a LOT if you have a website with your art on it so I can click on the link you provide in your query and see what you've got.
You'd be a savvy author to check out the Society of Children's Books Writers and Illustrators. They have author/illustrators by the wheelbarrowful.