iPhone App UI/UX design

I am looking for help to finalize the UI / UX design for my iOS App. The app is ready, I want to put it in final styling shape, and need advices on UX. The freelancer shall be capable and skilled in iOS, and have enough experience in this field. The freelancer shall show me samples of his previous similar apps, or proposal of what he can do. Having said that, i'll expect a beautiful design by arranging the views, buttons, colors, sizes...etc and a UX to attract the users using the app. I prefer working on hourly bases.