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I have full illustrated books in Word, finished for POD in PDF, .jpgs, full books as .rar files that convert back to IE pages. Text is often highly modified with Photoshop and inserted as images or overlain as .psds then turned into jpgs. None of this material is suited to usual formats accepted in queries and I can't see much of it can be offered preserving its character in WEbook as your site is.
But, it should be easy to arrange for us to hang up interconnected full page .jpgs or such of illustrated works as an extra venue of opportunity for us in here perhaps as natural site evolution toward better.
Please email me for option samples if you wish to consider exploring extra opportunities from any of it?