It probably differs a little depending on secondary age and primary age.
Secondary age - definitely better fashions, more money, kids more attuned (for better and worse) to social media and appearance. I’m in that Gen X generation where we had daily showers, hair washes, clean uniform, reasonable nutrition etc.; but parents were bothered about health not cosmetics or looks. My mum cared about my teeth and diet, but the outlook of the day was about healthy teeth and the cosmetic look of them was considered frivolous. Same with clothes - my mum bought clothes for us from John Lewis, M&S etc. but it was more practicality, and she did not get involved in how they looked (hairstyles too). I had a pretty face underneath and was washed and clean with a decent diet, but I had an unflattering haircut, NHS bottle specs and unflattering clothes, but then in those days mothers didn’t see their job as making you look pretty - and very definitely my own mum didn’t!
There was also a bit more of an awareness that magazines etc. were a bit unrealistic, and you might dress up and do makeup and hair for a special occasion, but the rest of the time you were just in your school uniform or a t-shirt and jeans looking normal and “ungroomed” — but that was just normal life. As for learning makeup and what suited us - that was just trial and error and your mum left you to it. You would also as pp have said, have had far less money available to try out different styles and products — the ethos was very much that that was for when you were older and earned your own money.
Acne treatments are a lot better now than they were. When I was a teen there was pretty much nothing between Clearsasil or topical antibiotics, and going the whole hog with Rocaccutane, which GPs were very reluctant to prescribe unless it was very severe, because it can have serious side effects and needs liver monitoring and contraception whilst on it, especially for girls.
Now there are a lot more effective topical retinoids that can clear moderate acne without the really harsh effects of the severe drugs. I was prescribed a new retinoid gel in my 20s after it had just been licensed and it was a complete game-changer - if it had been available ten years earlier I could have saved a lot of that teenage acne angst.
I’m not sure that the current age where teenagers are very hyper-aware of appearance is wonderful, though. There’s something to be said for allowing teenagers just to be teenagers and not be quite as obsessed with appearance. (Also, bear in mind that lots of us in previous generations also went to single sex high schools, which has been far less the case since the 2010s when most schools apart from top grammars and independents have now gone fully co-ed.)