Popularized on Tik Tok and other social media, "face card" is used to refer to a person's facial attractiveness. Mainly used to refer to a woman's beauty.
Ella may not have a huge ass or rack, but her face card is always valid. She's stunning.
I got into the club because of my face card.
Face card season refers to the time when there's colder weather. During the cold weather, people are more likely to wear thicker layers and more jackets. Revealing clothes are not worn, so you can't really see others' bodies. This means when judged or being looked at by others, a person's facial appearance is the only thing that can be judged, not their body figure included.