Thank you for your response. Especially for number two and three I'm 100 percent with you.
The second one's former version was without the hole in the wall behind her. So it seems I was a bit to impressed by my idea with the hole to emphasize her a bit more.
TBH the third one isn't really a final state. I just tried to do some DOF.
With the last one I'm really happy. It's more or less a portrait. And unfortunately I had no idea to make it a bit more interesting. Suggestions are welcome.