Ngaire, I am glad I was able to help. The whit of the eyes are not pure white. One must experiment, by mixing and correcting mixes in order to reach the desired hue and value. This is how you will receive the grayish hue/value for the white of the eye. A solid understanding of value, temperature and hue is what one needs to paint well. Drawing and the values are the essentials and the foundation. Master these and the hue will tag along with a little extra study and experimenting.
Again, my sincere wishes
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