50 sketches a day critique

Hey, just found out about this website and thought it'd be a great way to practice drawing. One thing I decided to try and do is draw 50 sketches at 30 second intervals, and I wanted to see if I could get some advice/critique on these kind of drawings.

I decided to start with animals, but will be doing different ones each time if possible.

I’m not a professional or anything, but they look great to me

Look very expressive!