Sober

First I noticed the skin, especially the forehead and its strange dark and light cloudiness (we call it cloudy in German, those dark dots/waves).
And it is the skin I like least, it is too coarse, which I guess it is not, I would soften it quite a bit to give it a natural look.
I like the contrast between the soft skin, the rough background and the hard glance the model gives the camera.
I would try to lighten the eyes a bit, remove the white dot on the tree and yes, soften the skin.
My first thought was: I would like to shoot with her...

Now whats art? My English is not proficient enough to start a philosophical discussion, though you might tempt me in German.