I think the problem is not enough people are seeing it. It's not that your artwork is lacking in any way. I only noticed it incidentally on the new category. But that was only by chance. I think as more people follow you, and click resteem, which in turn creates more viewers which will like and comment on your great work, the rewards will come. I think it is all about consistency as Steemit says and then your following will grow:
https://steemit.com/faq.html#Why_are_people_getting_vastly_different_rewards