Armand
I don't see a lot that's wrong with this, and there is a lot to like. It's a wonderful tree, and you have framed the shot really well. The open book is acting as a reflector, and is bouncing a little fill light back into the face of the young woman - I don't know if you posed the shot like this, but either way that was a neat trick.
The only (very picky) problem I have is that the subject's hair is rather too dark for it to separate nicely from the low values in the tree behind.
John