Great work on your basic, graphic lines and shapes of your animal sketches, msImpossibility. Very good job on, especially your 30 second gestures of your critters.
I've got one smallest suggestion: I love how much gestures you've got going on there, but I'm not seeing enough of the negative spaces, forms and proportions here in any animal, doesn't matter which one. Would you kindly be able to pick any animal that you need to work on, and later do a quick but long 10 minute beast study??????
The reason why you should need to do the 10 minute drawing is because, it can and will be fairly useful into getting better with your animal forms, proportions, gestures, spaces and anatomy.
Cheers.