1. Answer: It depends on everyone's taste and these rankings change all the time. According to RankMyPorn, at the moment, the top ranked Colored Hair Female Pornstars in the world are: Yurizan Beltran, Jewelz Blu, Jasmine James, Britney Amber, Anna Bell Peaks, Amy Reid, Ava Devine, Sally D'Angelo, Jelena Jensen, Jenna Foxx, but these will change based on what people vote.
2. Answer: It changes. You can see the latest rankings on RankMyPorn.com and also vote on it for free.