30 seconds and 1-2 minute pose critiques

Hi guys! These are a few of my latest gesture drawings. I do them almost daily. What is the most obvious thing I should improve on? And would a bit of shading be possible within the time limit? The time is already pretty narrow and I try to keep track of my drawing speed and thinking time and it seems i can't humanly draw much faster, or will that just come with more practice and time? Thanks in advance!

1 minute poses
https://imgur.com/44h0ldI
1 minute poses
https://imgur.com/uCYja9Z
2 minute poses
https://imgur.com/5KYMCQH
2 minute poses
https://imgur.com/VJ4u7iC
2-3 minute poses mixed images from pc and gesture drawing in the streets.
https://imgur.com/hlQvAm3
On the left: 30 seconds of only watching and drawing from memory afterwards.
On the right: 1 minute poses
https://imgur.com/VKVvob1
2 minute poses
https://imgur.com/dnYSDdH
1 minute poses