Great app but some suggestions

This is a great app and it helps relax me. But I wish there was more we could color and have all the colors free. I’d give this app a 5 star rating but you have to buy so many pictures if you want to color them. And there’s really cool colors but you have to buy those too. And all the new pictures added always have to be bought. I would like to have all the colors free and more pictures to color free.?

BLinvest about Recolor - Coloring Book, v4.1.2