keep your elbow in and look at the form in this picture:
http://images.google.com/imgres?imgurl=http://lakers.topbuzz.com/gallery/d/14767-2/kobe%2Bfree%2Bthrow%2Bshooting%2Bform.jpg&imgrefurl=http://lakers.topbuzz.com/gallery/v/kobe-bryant/kobe%2Bfree%2Bthrow%2Bshooting%2Bform.jpg.html&h=640&w=510&sz=39&hl=en&start=17&sig2=mDNhR4IZBXYScXUNwcealg&tbnid=gW3UEQ7WIgR4rM:&tbnh=137&tbnw=109&ei=LlY5SIGeKI7aiAGvi7zXCA&prev=/images%3Fq%3Dbasketball%2Bshooting%2Bform%26gbv%3D2%26hl%3Den%26sa%3DX