Hi, For that type of image, I think you have made a good start. I assume you were going for the hard shadow extreme left - I think it works for the image. Also, balance with the sky seems good to me.
I find the relative highlight to the right on the flat roof distracting - the wall is OK IMO. I would have tried to zoom your flash-head to throw the light more tightly on your model. And I would have experimented with feathering the beam across very slightly in front of your model. (Google 'feathering light')
But testing these things out is half the fun & digital makes it so much easier. Cheers