Illustrations and such will never work in e-books. In 10 years time resolutions will be so high that your now-useful 1024x768 or 1600x1200 illustration will be a blurry mess. (I don't know if there are any e-readers that understand SVG... I've never seen an SVG illustration in an e-book either.)
Illustrated books are actually the only reason for me to still buy paper books now and again. I'd buy an illustrated paper version of ASoIaF or HP, for example.
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