In the first clue for @MortalMovie's reveal of the third graphic in their #ShareMortalLove celebration, we saw some light with the clue "There is a lot of light here". Could this be signifying that the Lightwoods are in the room and that we might have Alec Lightwood in the main reveal with Isabelle in the background?
Here's a look at the second clue:
Protecting my loved ones is the most important thing. Can you guess who I am?