even though your paint store doesn't have the examples, relying on digital photographs really doesn't help you either
because cameras take photos under different lighting conditions, the colors are going to be different every time
i've seen 2 pictures of the same bug, taken in different lighting conditions with a different flash etc, and one looked beige, one looked robin's egg blue
so you can never really trust what a machine shows you, over your own two eyes
have you tried going to a different shop?