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I think the colors may be a little bit too drastic. No one usually enjoys looking at pure M or pure C...they are just too harsh to be enjoyed. Maye a bit of gradiation in the background? Also, try using a different brush on your illustrations, that simple 1-2pt basic round brush is kinda boring. And then I guess the cyan woman's boobs just bother me a bit...too softball-like.
 
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