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Based on comments here, we have decided to drop the subtitle for Professional No-Limit Hold 'em
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This will improve the cover IMO.
Anyway, here are the revised rough drafts (still with subtitles). The colors are similar to the brighter ones I tried above but I toned them down just a slight bit.
I tried using a Queen on the second cover, seems to work for me, but I could just as easily use the king for all of the covers. Or, a different king. I could also reverse the colors or change wahtever.
If the authors think there's a good chance there will be more than three volumes, there are a few limitations in terms on design continuity - I could make cover 1 a king, 2 a Q, 3 a J, but then do I do another K for Volume 4? Minor issue.