Do you have a screenshot of the Blood Elf eyes? (for comparison, not proof) My point wasn't really that it's fully modeled, which all glow eyes are going to be, but that you can see the eye model for Tyrande isn't set up for a regular (or just different colored) glow. Dunno if these top ones are what you're talking about:
But you can see that the fully modeled ones even from BC are basically very bright colored irises, which have a glowing "pupil" rather than the normal everyday black one, because that subtly reinforces the glow. Tyrande's model has a regular colored iris and normal eye black pupils. Which suggests to me that it's either not meant to glow, or that the glow effect being applied here is very, very different--Like it's going to be smoky darkness emanating from the eyes, a la: