First, Welcome to DPChallenge! I see this is your first entry and what an entry! I love this shot and I love the composition. Very nice lines leading me in, taking me up the arm and through the body. And a nice body, ;-) ;)
So what went wrong? Well, as said in earlier comments, the high contrast is a bit much for this to me and I like high contrast shots most of the time. But there are too many hot spots where all detail gets washed out. If there was a way to leave the contrast and high lights on the blinds but soften the body somehow I think this shot would just WOW everyone. Being a basic challenge that is very difficult but now outside the challenge maybe, if you want to work it a bit more and see what you could do I would love to see the results.
Hope my comments help and good luck in future challenges!