Here's an anatomy study I've been working on a little bit. It started out with a plain round brush but I decided to get a little creative.
Right off the bat I would say that her calves and feet are huge, and you might want to rotate the canvas a little bit because her balance feels off.
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As Bai Fan said, you should work with her legs. Besides the fact that her calves are really big, her feet seem to go out of focus, like you're trying to avoid drawing them. And, as Bai Fan also said, she's kind of off balance.
The brush strokes are a little messy, and the white make my eyes burn... try colouring on a coloured canvas next time.
A little more work on the shading would also help.
Besides that, good job! Keep it up!
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Getting creative is a good idea, but using only one type of brush to create a drawing is a bad one. Choosing a dirty brush for this - especially if your knowledge of anatomy is not solid - is not the best idea again, cause you lose the ability to define solid forms. I advise you to use that good old round brush to lay down the basics, and get creative only when the forms and shading looks fine. This would also make your work easier to crit
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