It's actually something of a trick, and also shows in their general approach to fursuit heads w/ hard, shiny plastic shells over the eyes instead of the 'matte fabric/foam' eyes more common in Western fursuits:

http://www.furaffinity.net/view/9990059/
http://www.furaffinity.net/view/9400542/

In effect they treat the eye like a glossy sphere and create the highlights based on that, in effect either creating (or finding a close approximation in photos of) the scene the character sees and using it to create the highlights on a sphere which they map over the eyes.

http://anako-art.deviantart.com/art.....edit-341668174

That's one example of how to do it, but coming from the 3D gaming world I know that there's hundreds of freely available 'Skybox' textures out there, that can be quickly mapped to a sphere to get something to work from as reference to draw the highlights as well. The macro-lens-like reflection is tricky to visualize versus normal perspective drawing.

oo! If you haven't set up custom brushes yet, I totally suggest http://darlingmionette.deviantart.c.....shes-162081137 :D the settings for 'Paint' and 'Gore' are my favorites I've used. (I have a whole ton of custom brushes)

...Duuuuuuuuude! OwO Ha, I should make the Copic brushes, now that would be redundant, lol!

Major improvement from two years ago! I can see this can be an awesome logo for a mardi gra thing!