I adore Shakesville's Impossibly Beautiful series. Especially this right here.
I could care less about airbrushing flyaway hairs or zits. But when you airbrush out the lines around someone's eyes, you are literally removing part of their facial expression. A part of how we tell real smiles from fake ones is how the muscles around the eyes move.
By airbrushing the expressions off the models' faces, they're kicking the images into the Uncanny Valley. Some of them are actually creepy.