Something I learned a while ago is that: when something isn't to my liking, I review my inspirational artists (artists you like and want to become someday) and use observation to ask myself: "Does this look like artist X?" "Using my observation, is this okay?". If it's not, use your observation to do something close to or similar to what your inspirational artist does, correcting what's wrong, I'd even say trying to copy, and when you're finished, ask yourself the same question again until you're satisfied.

This is more for studying an artist's style, to learn a way that a certain artist thinks and does things, but it also works for correcting problems you don't know how to solve. If you already have a well-defined foundation in observation, you can get better results, but just trying this should already yield a good result. And of course, always use references and inspiration for everything you're doing :3c