I don't find shots like this appealling so my comments must be taken from that viewpoint, don't be offended. I am trying to look at it within its genre and putting my personal thoughts aside.
I find it all a bit contrived. What is it saying, what's the knife all about? It comes across to me as one of those shots where they want to show a bit of flesh but need something to hide the 'naughty bits' so grab anything they can find and say 'hold that across your nipples!' I know that sounds harsh but my point is that the whole image needs to hang together and say something. I don't think this does as it is a lady lstanding flat against a wall (defensive position) and the knife, however sharp it may have been in real life, doesn't come across as sharp or else she wouldn't be pressing it against her boobs albeit with her thumbs just behind. Her facial expression is mildly threatening I guess but frankly that doesn't seem the point when she is naked.
So overall I just don't 'get' what the picture is trying to say. As the dispassionate viewer I am simply feeling 'Why is a lady standing there naked with a knife across her boobs?' They say every picture tells a story but I am not sure what the story is supposed to be here.
Sorry, hope that wasn't too harsh, as I said it isn't my type of shot so feel free to ignore me
Cheers,
Rob