Hair texture on women in comics is only marginally less variable than eye color on women in comics. Which is only marginally less variable than, say, the visual look of anthro-type characters like Croc or Cheetah.
Generally the Lances have wavy heavy hair, though, yes; when it's long enough, it hangs straight under its own weight, but when shorter than about shoulder length it curls itself, so both of them should be a lot more ringlet-y here.