I've always loved to draw. It's relaxing. I watch cartoons. I wanted to be an animator when I was a growing up.
People, scenes, animals. Both realistic and stylized.
Time. Art is as much a trade as anything else. It takes constant practice to get good and maintain it. Software paid better than art.
I have a bachelor's of arts, in art. I would draw, paint, or create for 20+ hours a week, every week, for a couple years. I also have an associate of arts in graphic design.
Ultimately, I do not practice anymore because I love programming too, it pays better, and there isn't enough time in the day to be great at both.