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There are heavily illustrated books with weighty serious content. Terry Pratchett's Last Hero and Neil Gaiman's Stardust are two examples I have standing on my shelf. Both are very much not childre...
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#2: Initial revision
There are heavily illustrated books with weighty serious content. Terry Pratchett's _Last Hero_ and Neil Gaiman's _Stardust_ are two examples I have standing on my shelf. Both are very much not children's books. You want to go even more serious, there are the famous illustrations by Gustave Doré to Dante's _Divine Comedy_. And of course you can look at the graphic novel genre. It takes the illustrations side of the book to an extreme, and some of them deal with complex, weighty issues, strong negative emotions, etc. Look at _[Maus](https://en.wikipedia.org/wiki/Maus)_, for instance. So, as far as story content is concerned, there's no reason why you should cut down on the illustrations. The real problem with this format, I think, is that it is more expensive to produce: it requires an illustrator in addition to the writer, it requires better quality paper, coloured print, and probably some other things I don't even know about.