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I would take advantage of the extra time that 2 minutes gives you to sketch out a frame and start thinking of visually measuring your figures as you sketch them. It looks like the proportions are a little unnatural in some of these which I totally get with 30 seconds since you're just getting down the general shape, but with 2 minutes you can start to pay more attention to making the poses more believable or structurally sound. It gives you a better baseline for when you get to those 5-10 minute poses!

Nice job! Seems someone else touched on this but I would try to pare down on your lines and make your marks a little more purposeful. You do have a nice looseness coming out in some of these, but the more you can rid that uncertainty in your markmaking the better. :)