The eye covers make the eyes look milky...if you look at their eyes you can tell...
Done shedding: http://www.rainforest-gr.com/Erpeta/Ball-python.jpg
Still covers on: http://www.rowlhouse.co.uk/photos/Ot...rassSnake2.jpg
see how it has that milky cover? it might not neccisarily be blue, but it will be milky