If you are using Android Studio and want to emulate on a Galaxy S6 or any other phone in the S range, you can download the skin from http://developer.samsung.com/galaxy/emulator-skin/s
To install it, check out this video here: https://www.youtube.com/watch?v=sSc9D4rrOxw
Go to 3:24 of the video to see how to install it in Android Studio.