Rear curtain flash would have been better here.
That way you get no transparency like that.
Exposure for the background, and at the very end you have the person stand there and then "POP" the flash fire and the exposure is saved.
Cool! Rear cutain flash would take out the stars? I didn't know that! I though everything works on exposure, as long as the person is not presense at the location the stars will start to gather enough lights to be at the person's head anyways?
But i'll try that next time. Because at times, i want that