"Well you should care about how you look," Lavender said, matter-of-factly, "It's important."
With a practised roll of her eyes for the benefit of those easily offended by vanity, she added in a drone, "Obviously it's not as important as what's inside, but even though a lot of people don't want to admit it, the first thing people judge you on is your appearance. No one wants to admit to being shallow, but people are more likely to respond positively to someone they find visually pleasing."
Lavender bent down to whisper in Neville's ear in case people were eavesdropping, "You might not have founded the DA, Nev, but you are the DA. Your appearance should reflect your feelings, so I'm going to make you look good."
Well, she thought she was being complimentary, and it's the thought that counts. Straightening up, she combed his hair once more and picked up a scissors. "This won't hurt a bit." Moving to the side, she brushed her comb upwards and began snipping.