They seem very gestural. You created a pinch and a stretch which is something Proko stresses in his gesture drawing class. Nice job! It looks like you were also looking down the mass of his body to find the direction too judging by the construction lines which is also really useful for gesture. I like the straights and line weight on the bottom, I think it adds alot of weight. A few criticisms - On the seal on the left it looks like his fin was drawn considering contour mostly though. You could make that shape much more gestural simplifying it with CSI and considering the pinch and stretch. His tail also ended up quite stiff, I see a flowing s curve for the gesture there.

this is amazing! Keep it up!

Very cute :D I like how you experimented with different styles ranging from very simplified to more realistic. I think it would be helpful in the future to include any sketching/construction lines you used to give more insight into the process and keep things more experimental and exploratory rather than clean and polished, for this assignment in particular. I think using construction lines can also give more dimension to the drawings, like the hind leg for the realistic cat or the muzzles for example, and will help you in creating a variety of different poses/angles.