Quote:
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"A photograph of a trademark may infringe the rights of the owner of the mark, but generally only where the photo might give the impression that it was produced by or belongs to the trademark owner."
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From
UK Photographers Rights
I would also be inclined to ask for evidence that they have registered their 'image' as a trademark. I suggest reading the document linked below - that has a very good explanation of the relationship between Trademarks and Photographs.
http://www.bapla.org.uk/resource/file_1184177058.pdf
My understanding from reading this and other sources is that you can have a 'trademark photograph' of a person (and presumably of a band) but in order for you to be infringing on their trademark your photograph would have to be sufficiently close to their registered image. If your photograph is different (different angle, lighting, composition) then they should have no grounds.