This serenity of the models face is beautiful in this piece. The sun truly bounces of the skin and is accentuated by the darkness of her hair. This picture screams carefree, and it is a beautiful thing to behold.
Unfortunately the only thing in this picture that dampens the serenity of the model, is the plastic lawn chair in the background. There is a blue dot that was captured on film that took my eyes away from the initial image.
My one change would be to have moved the chair and then centre the image better so the model is the main viewpoint.
Other then that, this is a lovely picture, and the model is beautiful too, Kudos!