Hallo,
I would like to share a tip given to me...
If you have the person posing for you put one foot forward, his/her shoulders will slightly tilt and the person will 'lean' in to the photo which make a beautiful portrait shot...
Believe me it makes a big difference..
Maybe you can also consider a 'softer' background, perhaps green foliage to compliment your model..
Hope this is helpful, and thank you for the opportunity to comment on your work!