Which picture should I use for my Cassie portrait? thanks

I amor drawing portraits so I thought I'd attempt a Cassie one for the friend who introduced me to skins. I need help picking a picture because I just cannot make up my mind. I want it to be as " lovely" as possible :)
I know there's alot of links but any help would be much appreciated. here we go:

1st:
link

2nd:
link

3rd:
link

4th:
link

5th:
link

or 6th:
link


thank you SO much for your time