The starting hair for the guys is really... lackluster. I hope there's another page that we're missing here. Since the other hairs are through Nook Miles, I guess they'll be quite quick to unlock though.
Still doesn't soothe my fear too much. There are two options:
1: You can just put on these extra hairs through your inventory or something.
2: You have to have Shampoodle style your hair to have it like that.
The first option is unsettling because there's no Shampoodle then. What other purpose would she serve? I guess she could be there for... exclusive hair later on? I dunno.
The second option is unsettling because we haven't seen Shampoodle yet, which hints towards her being harder to unlock and not really being an "early game" character. I'd be stuck with the ugly hair for like a month..