OK first off o meh goodness
(I'll try )
I'm assuming that is a female and the hand is a male, this situation could go in many ways ( I'll do two ways)
This could be a predator, a man whose lust has taken over him, who apparently found a female in the dark to suit his desire, grabbing her with all his might while covering her mouth so none could hear, yet she was able to escape from all her struggle and biting, running as fast as she could, away from the "demon" and soon enough she awoken from her dream to her room.
So basically I thought of it as a dream
( I shorten it so I wouldn't do a paragraph )
Here is my other assumption:
Since there are stars in the picture than I would like to think of it as she is lost in mind not realizing her surroundings.
(I lied I have another)
It could be someone warning, or someone who is familiar with her