Since you say it'll be scary later I'm wondering if you're planning on adjusting the expression. As it is she looks somewhat happy and has an anticipating look to her, sort of like a puppy. Maybe if you changed it enough that she's not so innocently happy but more in a sinister way then combined with the anticipation she'd look like she's about to attack?

I think now it's looking a bit disturbing, and the harsher lighting helps a lot. To some extent there's an aspect of fear here, partly from her looking scared and partly from us being concerned about what it is she's seeing/experiencing that has her in this state, but I'm not sensing the fear being something that she is purposefully causing. It's more like she's the one in fear and we feel it through her. The pure and near-pure whites you've used in her, her clothes, and the background all add up to giving an impression of hositalization. Maybe she's in a mental hospital? The collar on her neck certainly indicates bondage and being inprisoned because of the chain link on it. If you wanted to explore that further you could have some aspect of being wrongfully placed in a mental institute, something that does sometimes happen and is a very real fear that many people have.

you should make a black and red background. and the thing on her cheek should be red