I think you made a good effort. The pace was a bit slow for me and the story had to be know to understand what was going on but you was working with the story you had. Most of the technical things where ok just a few minor bit hardly worth mentioning. BUT the acting was not quite up to scratch in places. I didn't get the felling of empathy you should get with a character that had been through the horrible psycho torture and was suffering inside. It's very hard to follow the original so I think you were very brave to try.
All in all a good effort.