When I paint for myself I take as much time as I need to plan and not make mistakes
If you paint with no plan as this woman clearly is, you will be disappointed a lot.
A lot of people say you need "talent" or some shit to be good at art. I say fuck those people. You just need a really solid foundation of knowledge (which is a huge time and motivation commitment to obtain), the ability to analyze your problems and synthesize new thoughts to solve your problems, as well as the ability to constantly be thinking, never zoning out during your art time.
If you get frustrated with your artwork and throw your artworks away, you are not doing (or doing incorrectly) some of the things I mentioned earlier.