Good evening, Elster, this is Polyvios again. How are you doing tonight? I'm fine, how are you doing?? Great job on your range of expression and emotion in your quick poses and sketches, so far so good. My recommendation is that your poses don't get loose enough to my sensibilities. Would you please loosen up your dominant hand with a 1 minute quick sketch of a figure drawing? There are lots of ways to polish up your drawing skills.
The reason why you could and should loosen up your hand is because, your relationships, angles, tilt and directions will become the loosest and flexible in your proportions and perspectives. For more details on perspective in general, be sure to look into this one here, and this one, too.
Good luck to you and your tremendous goal.