I have bought eyeshadow and other types of makeup in the past, but i forget where... Where do i buy this type of stuff?

You can buy stuff like that in the Grooming Parlour, which can be found in the main shops under commerce.

if you know what you want to buy specifically, you can buy makeup from users' shops.

honestly i never know what im gonna buy... thx you guys you were very helpful!!! tehehe