Skin is not updating?

I changed my skin to a blue dinosaur girl skin. But when I came to check if it is not my old skin on a minecraft skin viewer, it still shows my old skin. Can anyone tell me why it's like that?
Proof:
The current skin I am using: http://imgur.com/X3WSi4i
What the skin viewer shows:
http://prntscr.com/4tg2ol