Which picture should I use for my Cassie portrait? thanks

I Cinta 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 pautan but any help would be much appreciated. here we go:

1st:
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2nd:
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3rd:
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4th:
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5th:
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atau 6th:
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thank anda SO much for your time