Tested out Hexel's ability to make variable pixel size and convert opacity to size.
First did stuff like bottom left for a friend's capstone project who needed a cat face texture, did a few tests and minor tweaks but final version is bottom one.
Noticed while I was drawing the chesire looking top left one its nose looked like a skull so I pushed it a bit further that way.
The top 2 faces remind me of some of my OCs accidentally.
I did top 2 after. Top right is straight up an old digital sketch automatically converted to test readability. Overall thought it worked but wasn't sure if it provided any benefit because it don't read at all from up close and it's hard to notice it's not just grayscale from a distance.