There are 4 materials which involve the eyes. Eyeballs Pupils Eyewhites Irises The Eyeballs must be set with min/max transparency = 100% I don't think you really need a texture applied to it, but something white or off white should do fine. It is really a reflective layer for light highlights. I like the effect if you set the trans sliders for the pupils to max 25% min 12% - to me it adds depth. Textures: get several - look at them in Poser and in your paint program - see the mistakes and what works - one point - go outside the lines a bit - there is a fudge factor - especially in the Poser window.