Here is an interesting blog by an author on ebooks:
He says the sweet spot for self-publishing fiction is $2.99.Though some think $3.99 would be a hair more profitable even with fewer books sold.
Of course the situation is different for a visual author, or someone contributing art to a Publisher's project, so this may have little bearing on your question. But all the considerations that go into pricing a book are broached here and are what your publisher is thinking about, so it is well worth reading.
Other blog material I have read suggests authors should be shooting for 60%-70% of the publisher's total take on e-books, however the base contract put out by publishers is for 25%. Text-based e-books are not that hard to produce, so the real costs are in marketing. If a publisher is not doing a lot of marketing, there is no real justification for taking the lion's share of the revenue.
None of this addresses your basic question of how much to ask for your art if you are not the author. Hope it is a start of the conversation.
On 5/20/14, 8:58 AM, Lore Ruttan wrote:> Does anyone have any insight on how pricing for illustrations in e-books varies from traditional
> print? I assume e-books don't go through first edition, second, etc or have geographical boundaries
> - does this affect pricing?
> /Lore Ruttan, /Ph.D.
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