If they do give void elves a blonde (I mean I'd be surprised if they didn't) I hope it's the lighter one you have in the top row and not the more yellow one in the bottom row. The top one seems more muted "every day joe" blonde and less of a "bright and sunny" blonde.
Assuming the hair colors end up just being ports from blood elves, and not brand new or from other races, These are the ones I'd like to see:
That would cover the basic range of human hair colors.