Most of all, hair should be added... But different types... The knit hat and scout hat are used way too often and players often look very similar. Things that would actually be useful...
Also there should be decals that express different emotions, one of which should be a normal expression. This would make RPing more in-depth. It would also add to servers because instead of having a name over a person, the player would have to actually look at the player to know who they were (if the host so chooses)
Also, the current decals are pretty useless...