James, I did my cover in Gimp, from an original idea by Moejoe, and I knew *nothing* about working with graphics before that.
Yours, if your avatar is your cover, looks pretty straightforward - you could probably recreate it, or something close, if you can't download the original in high enough definition.
Books change covers all the time without changing ISBNs - you could do something completely different if you wanted to, as long as the contents stay the same.
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