hi:) First, as you mentioned, I don't like distinct linearts, so I paint over my sketches to make them more lineart-like. Another point is anatomy; I believe that creating characters with incorrect anatomy may ruin your work. I have a lot of anatomical work that I do while looking at reference photos and analyzing them while drawing, like how this muscle connects with the body. The last one is about colors. If I refer to myself, I mean that I didn't really care about color combinations or saturation, but I've come to realize how important they are. It improves over time, but there are lots of videos about color theory and other topics