Eyes are possibly the most important part of a character, and learning to light and render eyes convincingly can make the difference between creating an engaging character and making a zombie. To get started, you can download the scene here:
The rules are to shade, light, and render this scene, to look like an eye. All shading and rendering techniques are fine, as long as your model is lit in 3D, with all the illumination and shadows coming from the light sources you add to your 3D scene. (This means basically anything goes except for projecting a photograph of an eye over the geometry...) Any minor tweaks you want to make to the scene are OK. You do not need to use all of the geometry if you find that this eyeball model has more parts modeled than you need. After you've posted your own entries, please share how you did it and try to help other people with their projects.