Hi there,
Hmm, I don't think I have any more than the typical advice of observation and practice. My style is cartooning, so I usually focus on line and shape, simplifying the form to the most prominent characteristics and emphasizing features that bring charm or personality. Understanding underlying anatomy always helps to a degree.
I would encourage you to know that drawing is a lot more complicated skill than a lot of people give it credit for. It's one of this things that takes most people a lot of effort to get proficient at, and there's really no ceiling, improvement after that is usually a long and ongoing journey. Some people might start out with some natural aptitude with an intrinsic sense of spacial relations but drawing is constant problem solving and exploration. It's very good brain exercise so just be patient with yourself, observe your subject matter and explore the paper.
Im still learning and definitely not perfect but I also think that is charming in its own right.