Don't have pics here to post, but i have seen up close all Portofino repeplica's: the black, the champagne, the gold dial and the white dial.
What I can say is that the black dial I certainly don't like. Because the blue color of the AR is a little bit too blue. Making the black dial look VERY BLUE from most angles. Even up close. If you really want black, then I would strongly suggest to remove the AR and get AR from Chief.
The gold dial I did not like. Looks way old fashioned.
The Champagne dial looks very classic.
I would prefer the white dial. Also with the blue-ish AR, this looks really young and modern, but still the IWC classic look.
Just my 2 cents