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I think you should do a series of famous people. You already have that hypnotic one of Thatcher. Perhaps every Prime Minister starting with Churchill? That would give enough for you to put on your own exhibition, showing big canvas prints. The problem would be deciding what to charge for them, an agent or perhaps the gallery could advise.
Or perhaps US Presidents, if you could find an agent in New York. I'm serious, we love seeing them here but you have a real talent for this and I'm convinced there are collectors who would pay a lot. "Special offer: three Presidents of your choice for $10,000."