In hand it would be hard to make a mistake, I failed miserably with my attempt to show correct color and depth of tone on this one. My thing is the coin I think should go RB and possibly a grade higher. JMO
I think taking a photo of a coin in a slab is difficult at best little alone trying to show correct color. But this my problem also. You may want to use the PhotoScape program and using the WhiteBalance using a known White Surface as its reference like the ANACS White Surface that is close to the coin as the reference.