Diane, thanks for the vocabulary, sometimes me no many English 
I fully agree that it's a tendril, kind of like on grape plants. A vine seems like a logical conclusion.
What I found weird about it though, is that tendrils generally don't curl that way. They will curl up in a spiral, kind of like a snail's shell, or curl more or less regularly, just like a spring. I haven't been able to find a tendril that behaves like this, sometimes large waves, then sharp narrow ones, then a rather straight part. It's not very natural.
Which again, is not to say that I think it's meant to represent a face. It could well be a coincidence.
I fully agree that it's a tendril, kind of like on grape plants. A vine seems like a logical conclusion.
What I found weird about it though, is that tendrils generally don't curl that way. They will curl up in a spiral, kind of like a snail's shell, or curl more or less regularly, just like a spring. I haven't been able to find a tendril that behaves like this, sometimes large waves, then sharp narrow ones, then a rather straight part. It's not very natural.
Which again, is not to say that I think it's meant to represent a face. It could well be a coincidence.