I saw this other player in a server and he had red eyes, when i asked him how he got them, he told me he was a lvl 20 monk that was human and evil, when i tried this i got blue eyes. Anyone have any ideas, how i can get red eyes.

Which head did he have? Did he have horns as well? I ask this because there is a tiefling head and IIRC, it has red eyes. Possibly you could do it through the DM client, not totally sure. A hakpak might also be able to do that.