More diverse books and pages with less detail and for more mature colorists.
For the majority of NON-GRAYSCALE pages for the longest time have included way too much detail, too many lines, etc. I find this confusing, messy, and takes away from using our own imagination and creativity. Also the content seems to be much more geared toward younger users.

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Destiny Myers commented
Right, I love the mandala ones but there is way to many small details which makes it hard for me to focus and concentrate as I have ADHD and Bipolar which makes focusing very hard. I agree with having pages with less details like most Mandela and gray style pages. The gray style pages are hard for me because it’s to much details and I don’t have a fully steady hand.
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Rhonda commented
I like that the coloring book has something for everyone, and I also enjoy variety. Even the best colorists sometimes want something quick, fun, and simple.
Maybe some of the artists will create a few more books with less detail. I can see how that would be enticing to some. Variety is the spice of the life ...
Goodluck, Lawrence! -Ron