I think it's clear that you made quite a bit of progress within those 3 weeks.
What I notice is, that your lines make the impression that you are quite tense. No need to hit the perfect line. I do like the imagery that was painted in one of the gesture drawing videos on Prokos Youtube: Imagine being a race car racing along the curves of the body.
I feel like you are a bit to focussed on detail here and there. You tend to draw in the muscles of the arms for example. What that tends to do is break the flow of the pose.
Another way I like to think about is: How can I make the longest possible line that still describes the pose?
Some examples: