Well, I finally finished my 6x6 project after well over 12 hours of work. (I think I spent too much time on this)
At first, I had difficulty brainstorming ideas. But eventually I settled on cats.

My first one is a tiger.

My second one is a leopard

The third one is a lion. One of my favorites.

This is an ocelot. This one is my favorite.

Decided to add in extinct cats. This is a Smilodon.

And my final one is a lazy domestic house cat. My house cat actually.