A pretty atmospheric picture! The fear shines through in all but her posture... might be like Jack said about the legs being too spread out, or her leaning against the wall? I realize now that it might be supposed to look like she's trying to hide, but my first impression is it was more like a stand-off, she's just sitting there, as still as possible... but somehow she appears a bit more relaxed, physically, than the monster merits. Otherwise though, great work!
-cd-