1hr study. What can improve on, and is this okay for one hour?

I feel like I'm almost done with lineart but been staring at it for way too long to see issues. Would really apreciate if anyone sees anything that feels off to point it out before I'll overcomit to rendering.

I didn't realize the back wheel is too far forward and I messed up the bumper a bit. Still good practice though.

I'm very much a beginner and recently picked up Michael Hampton's Figure Drawing book. I was hoping someone that actually knows what they are doing could help me to see more clearly what exactly I am doing wrong, how to work on fixing it, and if there is anything I'm doing well. Anything constructive is welcome, really. I feel like I'm going somewhere, but I don't really know where or if I'm going the right direction, if that makes sense. lol

On days 1-3 I gave myself about 5 minutes on each pose (sometimes a bit more) On day 4 I had no time limit, and I redid some of the poses from day 3. I was trying to be a little more "carefree" with what I was doing to see if that made a difference. The arrows are just indicating the order I was drawing the figures in.