Calliope was born deep in the Maguma Jungle. She didn't know who her mother was since she was alone when she was, what she believed, born. After traveling for a while she ended up in the Caledon Forest and from there on the Sylvari from the Pale Mother raised her. She sees the Pale Mother as her own but is never afraid to speak out where she's actually from...
The look is based on what she found in the jungle... She made her own clothes out of leaves and carries her Auric bow with her wherever she goes.
I think a bit more use of different skins would go a long way with the look. Screens are good and the colors work well together. I would consider adding more screens though to show off the look more.