I'm not an expert so someone please correct me, but I believe the answer is roughly: if the frame rate is lower than the "rate that your eye sees", then your brain replaces the frames that are missing with a blur so that the motion still looks fluid (hence why video at 24 fps still looks kinda fine to us, even though the frame rate is less than reality). This blur that your brain adds in would probably also cause your brain to have difficulty following details, since the details -- of the makeup, for example -- are constantly moving. However, if the frame rate is 48 fps, then your brain does not add the blur between frames since all the necessary data is available and it can more easily perceive details (like makeup).