I went through the proper steps to query a wonderful agent with my adult coloring book idea. Now she's asked me for a book proposal, which is great, but how do I write it? If it was a typical non-fiction book, there are many examples out there. Same with children's book proposals. But coloring books? I'm thinking it should be heavy on the art (since I'm an illustrator and it's a coloring book). Hoping it doesn't have to be as long as a typical non-fiction book proposal. Does anyone have experience with a proposal like this?