Re: My take on the "keeler Chair"
Strangely, while this has all the issues that you describe, I like the idea of doing this "iconic" shot without anything of the chair being evident.
Doing things like this is vital, both in learning how to improve the shot, techniques, etc., but also in being different and providing a fresh take on things.
I'd definatly try to get the sculpting shape of the chair onto her left leg, such that the chair shape is better defined.
As you say it's "My Take" on the original and I think it's a great idea.