This is easy.You just have to know all of the lego star wars figures (which is pretty easy if you are a Star Wars fan)and then try and memorise it.But even if you don't memorise it is quite easy!The thing about Boba Fett and a snowtrooper is that their masks aren't so simmilair.The Snowtrooper has a longer mask with a round on the top and the backpack is smaller.And Boba- his mask goes only to his neck and has flat on the top of hid head and the backpack is in a sort of a triangel and is verry easy to sense.But still I have to admit this girl is imressive!