Those taking part in an experiment were shown 16 pairs of images showing a woman made up for a night out and her make-up free. They were then asked to choose the better leader.
The faces and the amount of make-up shown was manipulated by computer software for the research, which was published in the Perception journal.
Women were evaluated more negatively as a leader if the image suggested she was wearing a lot of make-up. This was the result for both male and female participants.