Here are some of my recent bean drawings, could I please have some critique? I'd also like to know if it's time to move on to the next lesson.

I've been practicing gesture again recently. I've watched all videos that have to do with it, and have followed along with a couple of Stan's examples. Here are some of my recent gesture drawings. Some are 30 seconds, some are 2 minutes, and some were drawn without a timer for the sake of learning. For some reason I feel like I'm doing something totally wrong with them, but I can't pick out exactly what that is. Can anyone please give me some critique or advice?

I'm new to drawing, and I've been trying to practice gesture. I've done many gesture drawing sessions, yet I feel as if I'm still not getting it right. Here are some of my drawings, most of these were done in 30 seconds. Does anyone have any advice or critique they could give me? (Sorry about the shadows in the images).