Vampires eyes can be any color, the different vampire books have their vampire's eyes different. They can change color depending on hunger (thirst), or they could be the exact same color as they were in their human life, they might also be the same color but be a little brighter than their original color.
Cross Yuki's eyes in Vampire Knight are depicted as a reddish-violet color. This unique eye color is a significant characteristic of her vampire lineage.
He has emerald green eyes.
His eye color is brownish green.
No, a vampire's eyes do not have to be red to bite a human. The color of a vampire's eyes may vary depending on the lore or story, but it is not a requirement for them to feed on humans.
edward cullen's <3 eyes before he became a vampire were the color green
Edward's eyes were green
purple
His eyes are red.
Red when she has turned into a vampire
glowing red
Brown
Edwards eyes are green before he is changed into a vampire by Carlisle.