I didn't make the ascii art and have no idea how to lol. Just the gravatar :) But if you want to try making a picture that looks similar to that (or to the grav you have right now!) here's the website I used
https://www.piskelapp.com/
It's free, but you should use it on a computer, not a mobile device. I used my laptop trackpad since my mouse wasn't working but I definitely recommend having a mouse.
I set the canvas size to 200x200 which is how big a gravatar is.