Between 2 & 4 I think 2's overall camera angle is stronger because we're looking up at here more which makes her seem more powerful than looking down on her. But both of her natural arms/hands get lost on 2, and you might work on making them stand out more in the silhouette. The nice thing in 4 is that both hands real clearly in the silhouette.
All of these poses are not really all that different from your front view in your character sheet. They're not adding anything interesting to the character, not saying anything the character sheet doesn't already say. You could consider some more dynamic poses, something to show her moving or in battle or attacking or doing anything else aside from just standing there. Good luck whatever you choose. 
