I have debated about whether to post this is Feminism as it does cross-over with feminist issues, but I do genuinely want an answer from a Style and Beauty perspective, so am posting here.
All this has been prompted by my lurking with curiosity on Jodie's BE thread.
Everyone who is raving about this make-up is rejoicing in how perfect it makes their skin look. This got me thinking about my own skin. I don't wear make-up at all. Once in a blue moon - so, for instance, once this year, back in Feb - I will wear some face powder, some mascara, and some lip gloss, but normally I just cleanse, tone, moisturise and go. I think I have decent skin and look ok. Admittedly, it doesn't look like the skin of someone in a make-up ad (i.e. totally consistent colour all over, no shadows, no hint of line or pore), but I am wise enough
to know something about air-brushing, so this doesn't worry me over-much. I think I look healthy enough, though with dark shadows, and not so hideous that I want to devote time or money to make-up.
Moreover, I've never seen anyone in real life look like they've stepped out of an ad. I've seen people with what I thought was good skin, who may or may not have been wearing makeup, but it still didn't look as "perfect" as a make-up ad. I've also seen people with perfectly made-up faces, but they are most definitely and visibly wearing make-up (so, apart from, say, eyeshadow or lipstick, one can discern foundation/powder on their faces). And they still don't look like make-up ads. They look polished, but not "perfect" in the way that, say, Julia Roberts does in that Lancôme ad, where her skin appears to be as flawless as a child's.
OK, so where am I going with this? In short, am I deluded about my appearance? Do people look at me in pity and think that my skin is not as ok as I think it is? Would most other women, were they me, wear make-up to improve my appearance? Are the people I see out and about who have nice skin actually wearing "natural" makeup? Do the people on Jodie's thread now all look "perfect" in the manner of a make-up ad? 
I've realised that the advertising industry and the "natural" claims of makeup wearers have meant that I have no clear sense of what normal, non made-up skin (on a 33 year old, note) should look like.
Anyway, enough rambling.
I'd be interested to hear thoughts on this.