I see a nice indication of line of action in your drawings- assuming that this is your starting point- looks good. It seems that you are doing a good job of connecting the major masses. Timing is likely challenging since you appear to get caught up in details-cross contours to establish volume, more subtle curves of parts of limbs. These are not bad things, you might consider focusing on one aspect at a time otherwise you’ll run out of time. You may also try to simplify. It your goal is to add volume, then try with very basic shapes, circles, cylinders etc. Marco Sordi has some nice examples of various approaches to gesture and quick sketch.

Hey, I just wanted to give you a quick critique and some advice. Your gestures are good in the masses, meaning you have a great amount of them completely, but the best advice I can give is to try and make less scratchy lines; it shows how quick you are with them, and it's okay to get frustrated, but don't let that take control over your lines. Try to tame them and make single strokes with them even though some may not look like legs or foreshortened body parts, but it doesn't matter this early on; the objective is to be calm and loose, so try to make single BIG strokes when making the figure but besides that your centerlines look great they are there to guide you so focus on using that line to make your spacing with the whole body but yeah looks good keep the motivation.