Speaking from experience, red is a pain in the arse to keep looking good. Because red has the smallest colour molecules, they don't bond so well to the hair cuticle so it fades easily. Plus its also really hard to strip from your hair once you decide to go back to blond. I briefly flirted with having pillar box red hair and pink highlights, and while it looked good after I'd first had it done within a week or so it begun to fade so I was constantly in and out the salon.
i think that its really sexy on you. I get really turned on by red hair because it shows how fiesty and energetic you are. I'm a truue sucker for red hair. that's my opinion. I could also see you as being a model. keep it up