The phrase "angelic face" means someone has a face that looks very pure, innocent, and beautiful, similar to how people imagine angels to look like. Full definition
A child's angelic face conceals a budding sociopath in the audacious, senses - shattering feature directing debut from actor Brady Corbet, with a cast led by Robert Pattinson and Bérénice Bejo. (colesmithey.com)
It's lazy mornings in bed adoring your baby's angelic face even though at 2:00 AM you were sure he was a spawn of the devil and not your child. (cloudninebirths.com)
Baby acne can make your little one's soft angelic face look worrying. (thankyourbaby.com)