I don't know! Maybe it's because I think up of new techniques and better ways to do things almost every time I draw! :) Improving is, happily, a natural part of practicing!

Thank you, Aspen!!

I use IbisPaintX a free mobile app! There are so many different tools you can use! And the only thing you really pay for (If you want to) is no ads! Which is only for earning all the tools for 18 hrs! And it's only like a 30 sec ad! So, it's my personal pick for an art program!