Learning drawing before painting will improve your artwork a lot. It actually makes a huge difference in every aspect of your art since drawing is a so-called “foundational tool”: you’ll be able to work with shapes, forms, shadows and so many other things that are essential to painting on a professional level. Also, when you draw you train your eyes to look at every item you want to duplicate on paper or on the screen, which differs a lot from how people who don’t have such fundamental things see them.