OKay, just the things that pop out to me.
#1 - the pose looks uncomfortable and the image looks under exposed.
#2 - you have dappled light on her face. This one would be cool to pull her about 10-15 feet from the tree and shoot it again.
#3 - flat lighting and possibly a hair underexposed.
#4 - again, pull her a bit away from the wall.
JMOH.