I go back and forth about tanning. It depends on what your complexion is the begin with, what color you're wearing, how much skin you're revealing, and lots of other factors. I will say that *most* open-level dancers tan, with standard dancers tanning the least. However, some don't, or at least don't appear to, and it's clearly not affecting their results (thinking of a few champ-level finalists at this past MAC). Personally, I'm already darker, being Asian, and while tanning gets me into comp mode, I don't think of it as a necessity. I really just hate doing it, even though I like the outcome. So, I save it for bigger competitions and don't bother for other ones. I also don't think it affects marks as much as other aesthetic things might (outfit, makeup, hair). I know judges tell everyone to tan, but ultimately, if your dancing is good enough, not tanning won't hurt you. If you are in the middle of the pack or if they're deciding between you and someone equally good but better groomed than you, then yes, it may make that bit of a difference.