I think that someone with excellent photographic skills could squeeze out a small toning premium, maybe $20-$40 more.
What Paul said , he's an expert on toners . But I like the coin , it'd definitely better than a blast white one .
i would say prolly closer to 10-15 on the bay for it being so nicely toned but quality photos are a must !!
Are those white spots on the slab ? If they are I'd try to polish them out or have it reslabbed because they will lower the amount you can get tremendously .