I already had these pictures because I posted them in another thread a while ago. Anyway, I had a similar experience with Evie Delgato from Brindleton Bay. She was friends with the offspring of one my Sims when they were children. I thought it would be cute if they dated as teenagers. So the day after he aged up I invited her over and this is what she looked like:
https://i.imgur.com/EzAfiZw.jpg
I had to edit her in CAS and I think she turned out really cute:
https://i.imgur.com/UZMe4Dr.jpg
I think that editing is definitely necessary in some cases. Alexander Goth is a good example for that. Bella is really pretty and Mortimer is reasonably handsome, but Alexander looks so weird when her grows up every time. But with a bit of editing he can look really handsome.