Women should do whatever they want to. Not everyone is the same, some women will prefer wearing makeup and some won't, just like some guys find varying levels of makeup attractive. I've dated guys who liked me without makeup, and I've dated some who liked when I wore quite a bit.
Women can also wear makeup for different reasons, it's not always about trying to look more attractive, for me it's about expressing creativity. It's art, and it's an accessory. It's a fun hobby for me and I love applying it.
The most important thing to do is to learn to love yourself with all levels of makeup. Remember you are stunning no matter what
If you're healthy, makeup won't do much for you except make you look less natural. Most girls look worse without makeup, but that's because most girls don't look after their skin, diet and exercise as much as they should. If you look after those things you'll have this natural glow and great look! :)
If a genie appeared and struck a deal, "You can have women keep wearing lots of makeup, or I will make no woman wear makeup but all women will exercise and eat healthy to avoid becoming cows" I would go for exercise and forget makeup.