Re: queen cell pictures?
They gradually take a darker, thicker, stronger look, and not too long before they hatch the bees remove surplus wax from the cap sometimes leaving the odd strand of silk visible. But only experience can properly teach you, rather than someting you read on the net.
If you need to move the cells, just do so, but very carefully. If they get bumped while being moved, they are less likely to be damaged if they are laying on their side, than if they are straight up and down.
"Thinking Inside The Box"