My first issue with Face Unlock, aside from the soon-to-be-patched eye detection flaw, is that it only allows me to add one facial print. On the iPhone, you can have one alternate "look." As my colleague Chris Velazco pointed out in his review, the Pixel 4 doesn't recognize me as the same person with and without makeup on. When I set up Face Unlock with a bare face, I couldn't get into my phone when I was done up. When I set it up with makeup on, I couldn't log in after washing my face. This was a problem regardless of how much makeup I was wearing. The Pixel 4 had trouble recognizing me even when I used a smaller amount, and only logged me in about 50 percent of the time.