Add the brow and eyelids.
One good way to get a feeling for how eyelids/eyebrows work is to take
a ball, and take two pieces of cloth ( you can do this with a basketball
or even a tennis ball and two tee shirts), and drape them over the ball,
leaving only about 1/4 of the ball exposed. Examine the way the light hits
the ball, and the shirts (which represent the eyelids). Do a few sketches
from this.
You may have noticed that the 'white' of this eye is no longer white.
No, he doesn't have pinkeye. :-) Shadow falls on the white of the eye as
much as the iris, and because of the shadw of the brow, even the top of
the white of the eye is in shadow (a darker gray). The rendered eye above
doesn't have any brows or lids, so it's highlighted, but in a real eye,
this would leave it too exposed.
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