pick a medium color for the base, and highlight it a bit with a slightly lighter color:
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then you can add some definition with a slightly darker color:
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next you can add some other colors in. Most of the time, eyes will have more than one shade. here's some ideas for colors that would work well: brown base- gold or amber accents blue base- green, teal, or silver/grey accents green base- blue, teal, or gold/yellow accents red base- orange, yellow, or gold accents and so on. But for this one i used green as the base color, and a green/teal as the accent color:
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(my pupils are usually a darker version of the base color. this allows me to shade the pupil, because if your starting color is straight-up black, you will never be able to shade anything. This doesn't only apply to eyes! *cough* nightwings *cough*) so here i shaded the pupil a bit:
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