Jean, I really hope you can talk them out of this composition. At 2.75 inches for the head sizes it will be VERY hard to get any kind of likeness. I don't think I could do it, and I wouldn't try. You're right that it will end up being just a painting of a dress (even if you crop out the train and get a slightly larger head size).
I hope you can convince them to make this truly a portrait instead of a figurative painting of a generic bride and groom. A three quarter length composition with less emphasis on the stuff around them will be far more personal and give you a much greater chance of success with the likenesses.
The smaller the head size the harder it is to get a likeness. A sixteenth-inch error on an eight inch head can be a problem. On a two or three inch head it can be a disaster.
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