The color of your eyes changes drastically. The color, whatever it may be, is unnatural and atypical of your species. Perhaps your eyes turn dead black, maybe they change color to suit your mood, or perhaps they glow faintly in the dark.
Modern System Reference Document © 2002, Wizards of the Coast, Inc.; Authors Bill Slavicsek, Jeff Grubb, Rich Redman, Charles Ryan, based on material by Jonathan Tweet, Monte Cook, Skip Williams, Richard Baker,Peter Adkison, Bruce R. Cordell, John Tynes, Andy Collins, and JD Wiker.