What does it means when a girl looks down immediately after eye contact?

Anonymous
This question is more for the girls, haha. I was the other day at the college library and there was a girl in a desk and when she made eye contact with me, she lowered her head very fast, like hiding under her cap she was wearing. I'm very curious, because I've encountered this girl before around campus, the other time was in the cafeteria. I was buying some food, she was with a group of people and she followed me with her sight. I don't know her, neither I talked with her or have her on social media. It's kinda weird. The only thing that can have certain relation with her was a drawing that I made of her and I had to presented it in art class, but it wasn't big deal with me, by the way I'm studying arts xD
What does it means when a girl looks down immediately after eye contact?
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