This is such a niche market. I have a friend who colors as a way of reducing stress. However, 20 pages a month seems like a whole lot of coloring. The pricing for the individual packages seems a bit more attractive than the subscription price.
Coloring pages "for adults" sounded like something very different from what is on the website, I gotta admit.
A subscription for this service?
Is the hello email address the best way to contact you?