Well, I personally didn't make them - a recent friend / great artist did it for me. ^^;
And it's very simple to make a pupil - just add a circle to the main line layer. xD
...and this is my original sketch/idea for them:
https://fbcdn-sphotos-a-a.akamaihd.net/ ... 5682_n.jpgThough I couldn't find someone to make it look just like it on the oekaki. .3.