I'm in love with the shadow shapes on the legs!
Maybe my main advice on faces would be: Keep it loose. Try to map it out with thin and light lines by throwing your lines in the general direction you want then go again aproximating to where you think it should be, rinse and repeat. All fast, all loose. What you will have is a bunch of light lines that become darker in the areas where they overlap because of repetition (And that's usually where it feels less "uncanny valley-ey?") Then you can erase or not depending on your style. If you're thinking right now that that's the same thing you are doing but with the body, you are 100% correct!
Having an HB handy is always great, even if gestures look amazing with 4b and upwards. If you want even easier to erase lines, maybe a 2H could work for this. You'll save a lot of time in the long run, leaving you precious minutes to make some more beautiful shadow shapes across the whole figure.
Did I say I love your shadow shapes already?
Best Regards!!
These 2 minute gesture drawings eally do captue weight and flow. There are some parts in which the anatomy becomes rigid (top left dawing and bottom center) where a more loose and freeflowing line could help you achieve the results you want.
I find that in my own gesture studies, when I feel insecure about certain anatomy, I tend to stiffen up my posture and line to compensate. Do you share a similar feeling?
Regardless, very amazing job with keeping the proportions intact and still mantain weight and flow. Beautiful work!