Good 1st try. Try holding the light on the other side when the girl has big bangs like that - her bangs are casting a shadow on her eye and face. You can also use butterfly lighting and still get that 2nd eye and top facial plane. You'll get better range with dark hair if you have a hair light. You can even use a reflector. Makes a BIG difference.
I woulda turned her to light her short and pulled her off the background a bit. I light everything short lately though...its more dramatic and skinny-ify-ing.
Is that one of those steel shed/ barn thingies? I shot strobist style by one recently over
here. You can light the background too with a separate flash. Hide it behind the person. It's FUN! Isnt it?
btw - I think it was brilliant of you to choose that background with her complexion and her eye color. Great color scheme. Its popular right now too (blue & brown). If you had more light in both eyes, they would really POP.