Did you follow Stan's step by step video on drawing an eye? I think his drawings can be generalistic. It might be worth drawing from life. Developing your own style.

There are a lot of good lines in those drawings. Many of them begin to flow with the figure and lose the halting scratchy feel from a hand that is unsure. I would suggest to move away from timed poses for a bit and try focusing on how you can describe large sections of the figure with minimal lines. 1-2 max for a leg or an arm. Keep asking how can I describe this art, or leg in 2 lines and really work on just getting that arm gesture correct, or leg or whatever. The reason why I suggest this is because gesture is super complex and when you add a timer to it there is a tendency to focus way too much on time rather than what is really important. Describing movement. Not just the movement of the person through space but the movement of a center line through a stationary form. Some concerted reflection on how to achieve some of these fluid gestures without a time will begin to influence how you treat the figure when your under the clock. look at different artists that are amazing at gesture as well. They all have a specific technique for describing form in the most simple of lines. I would suggest Steve Huston https://www.youtube.com/watch?v=SDVz9s6OYPQ Hope that helps! Don't be discouraged by the progress or seeming lack there of. It's completely normal. This art game is a life long thing full of amazing stuff. So keep going!