Most guys prefer the natural look. I love to wear dramatic eye makeup (I don't wear foundation or powder though). I always get compliments from girls but I've had guys tell me that I look better when I don't wear any at all. I think you should wear makeup for yourself, not what a guy thinks. I know that they prefer a girl to wear none but I'm a little different ;)
We don't generally notice and we don't generally care. Too much, or obvious would be a turn off. Too much time, attention, money put into would be a turn off. We never look at a girl and admire her for a good "paint job". We would just be focused on other areas of attraction we think about.
i think they are, just because it shows that girls put effort into their appearance. as long as the amount of makeup isn't overwhelming, then I'm sure its fine and they like it just the same. also, many girls fret over this, but you have to tell yoruself, most guys don't notice when girls wear makeup-as long as it looks natural, you're good!