Here's a lovely blue eye to use on your blue eyed characters, I left out the shine so you can add it yourself wherever you like, enjoy!
To use this simply drag it onto the page and resize/ shape as needed, here's a close up with more detail:
![](http://assets.clip-studio.com/en-us/description/2065172/img/fad0f3aa7a-e443-c397-978e-dbdca3de8c.jpg)