I personally like the quick faces far more than the poses. Accurately capturing faces is one of the most difficult things for me and I think you've done a decent job.
I don't think your brush lines look messy per se, but to me the poses do seem a little stiff. Granted, the poses you've done may all be stationary so that's probably a big part of it.
I think you're on the right path and my suggestion is to just keep pushing forward; focus on capturing the basic essence of each pose or expression and then build upon that.
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