The resolution on this image is VERY low -- it's making big pixel boxes on my screen. Did you mean to do that? If not, try to get as close to 150k as you can, that should help.
I think a portrait should reveal some character, or emotion of the model, by showing expression in eyes or other facial features. Did your picture accomplish that? Yes...even the location choice shows some character.
A bit soft in focus but nice placement on the page. I would have liked to see better lighting on you. To be honest, my eye is drawn more to the greenery behind the tree than to you.