I'd focus on starting to do some stuff you're not such a big fan of. Technically, the drawings are pretty sound, and all that it would take to refine them is practice. However, you're committing the terrible sin of trapping them in an otherwise blank sheet of paper. Put them on horses, add trees, a castle tower, anything! Drawing what you're comfortable with feels good, but it won't help you make dynamic, interesting pictures.
Loosen up your sketching as well. If you're just doing studies, there's no need to use a new sheet of paper every time. Fill up that page!
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Loosen up your sketching as well. If you're just doing studies, there's no need to use a new sheet of paper every time. Fill up that page!