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If you have a produced a new painting with a number of these pictures painted in to this new painting, then the new painting itself will have its own copyrght (Copyrights Design and Patents Act 1988. Essentially you will be producing a new work.
Copyright law is designed to stop people from taking another's work and passing it off as their own work. As the author of the new work you have the moral and legal right to prevent derogatory treatment to the work. Using a picture as an one of a number of inspirations/sources to produce a new piece of art in its own right would not amount to derogatory treatment and therefore you would be very unlikely to have infringed the copyright owners rights.
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Both the photographs and your have their own copyright and therefore both copyright owners (you and the photographer) have the right to prevent derogatory treatment.
Were some crazy far-right racist group to use the picture (or your painting) on their website then this would be derogatory treatment for example.
A court would ultimately decide if a particular act constitutes derogatory treatment, an alleged infringer would probably be contacted by the copyright owner before a case was issued.
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