Hmmm i definitely agree with the makeup comment, but then again, running makeup during of her cg would look kinda nice with the running mascara/lipstick with semen. But one way to fix the problem could be handled with elf magic which could be resistant to water when swimming. But the makeup isn't that important anyways, just throwing ideas around.
But the hair being a personality i disagree, if you have it short, or a ponytail etc its still Nene. What matters most is the person speaking and you'll still know it's Nene based on how she talks with everyone around or her she responds to her environment. But I do agree with extra work developing the physics with different hairstyles. So ultimately it's something that if it's easy for Mofu great, if it's not then I hope he leaves the extra stuff like this at the end of development.