There are 6 color options but only 5 different pictures of the colors. Blue and Sky seem to be he exact same. We need a pic to tell the difference.
Photos are fixed and captions have been added. That should help.
So to confirm, is the blue a lighter shade than the sky? Or do my eyes deceive me?
Blue is the first pic and is a brighter blue.
Sky is the 4th pic (draped over a chair) and is a darker blue.