It shouldn't just be limited to pictures. Here was the conversation that transpired between me and a patron of Walmart last weekend in Pratt, USA:
Person of Walmart: OH MY GOODNESS, are those twins?!?!
POW: They are so cute. They are identical.
Me: Actually, they aren't.
POW: No? They look so much alike! They aren't identical?
POW: But, they're twins (already looks thoroughly confused)??!?
Me: Nope, not identical but they do look more alike now than ever.
POW: So, what are they then?
Me: Fraternal twins.
POW: They aren't identical twins?
Long pause......wait for it....
POW: Are you sure they are twins?
Me: Almost 99% sure.