I only think that if I see het from across the classroom and I can see her face shine and how thick the layer of makup is..id much rather have a girl with no makeup and if she feels like she has too wear some then I wouldn't mind a little eye liner or mascara
I used to wear makeup myself =] So, when I notice a girls makeup, I look at it the way another girl would. Otherwise, uh... There are some types of makeup that really turn me on, blusher and lipgloss and glittery things get me off, hard, and if I see a girl with prominent makeup like that, I really like it. Otherwise, I might notice she's wearing a lot of makeup, but I don't think anything of it.
Yeah, I notice when a girl has makeup that is too heavy and almost has a caked on look. Subtle and natural is the way to go IMO. Things like glitter also make me think that person isn't terribly mature.