I thought you had to actually see the character in the server to actually see the skin in game. Eg. I see PizzaBrawler's skin and horsey4mec's skin cause i have seen them in server
To see every skin in Murder it is suggested to use a 1.7.2 client.
In 1.7.9 the client no longer stores skins, so you will see Steve skins unless the secret identity is online.