Here's an interesting series of pictures of models before and after makeup is applied (one, two, three, four, five, six, seven). To see the pictures you can also go to the main page of the Yossi Bitton Makeup School site and navigate through to the 'before and after' gallery, but beware of the annoying music. The after pictures have to be photoshopped. There's no way that makeup alone could conceal skin imperfections that perfectly.