For one minute or two minute sketches, I'd say these are fantastic! You have a really good sense of the placement of the ribcage and hips like with "the bean" technique. You also have some pretty good line quality in some areas with longer, more confident lines instead of sketchy, somewhat random ones. If you feel able, it would be great to see your heads and limbs a little more developed. Some of the sketches have a more complete sense of these parts than others. Overall, though, just keep doing what you're doing!
