It looks lovely on you!
You have it farther back than I wear a stretchy headband. Anything that wide I just wear up front with no hair showing through. Whatever works for you though is how you should wear it!
thats how i would wear mine! (if i had one ) with head bands i usually have hair showing at the front, and also some hair coming through over the ears too so its not so dramatic with all my hair at the back. its a more natural look (on me) but i agree with medus, it does look lovely!