I have to assume you didn't convince a model to pose like that for all too long, so I'm wondering how much work was done from reference photos. It's an absolutely incredible piece I one day home to come close to achieving.
I agree about the hands and feet - excellent. The body shape is good but there is one spot that doesn't look perfect to me and I'm embarrassed to write it so I'm just going to do it - the areolas don't look right. There I did it. Just for making me do this, I'm going to be posting a male nude this weekend. I might just send it directly to you. Great job really.