Here, my owls! First one is with pen tool, the second one with curvature. I prefer the curvature, not gonna lie :) Tried do to some shading too with Shape Builder tool.
Swan project, using the shape builder tool.
The impossible triangle, using the shape builder tool.
And this is my sleeping cat, with a stripy tail.
Sleeping fox, really enjoyed this tutorial, interesting to see what we can create using just a few simple shapes in illustrator.