New to Gesture Drawing

Hello everyone,
I've been taking 30 minute classes every day over the past few days and I would really love some feedback. I'm new to gesture drawing and am really enjoying it, but I am also feeling a little lost. My goal was just to start,to dive in and try something new, but now I want to get a better grasp on gesture drawing. I have a few examples from over the past few days and would love some insight into what areas I need to improve and focus on.
thank you :)

30 second birds
30 second faces
5 minute faces