there's honestly a kinda wide variety in ways to draw tears. best bets would be looking up tutorials in places like deviantart, youtube, pintrest and the like then practicing till you find something you're comfy with
i'm not sure if there's consistency to how i draw tears but it's usually some variation of these along with other expressions:
like mentioned in other replies it helps to look at references especially photos so you can get an idea of how a face's shape changes when crying. looking at others art and even cartoons/anime to see how it comes off in different styles.