wow thanks everyone I never expected so many restorations so quickly and they are all brilliant.
I have no idea if the photo is flipped or not, it is completely black/brown on the other side of the glass.
The greeny colour surrounding them looks to me like it has blanked out what ever is behind them, kind of like a badly done photo editing job, hence the strange floating hand on shoulder and the why their hair is cut off in areas, plus the area where the woman on the right, arm is resting
This plate was in my grandmothers possession (she recently passed away) and it was in a completely smashed/broken frame, due to how it was stored.