I think you could get something on the basis of seeing Potterverse wizards as people who try to hit some bit of popular culture, and miss. So you get a streak of Dickensian London in Diagon Alley, as presented in BBC dramas. And a wizard detective might have a deerstalker and talk like Sam Spade. I think that might help in developing a setting for a render, as well as clothing styles. It occurs to me that the Weasley household has a resemblance to the TV version of The Darling Buds of May. Speculation: if you had a wizard who was really into science and technology as a tool, would he be a sci-fi technomage, or would his robe look more like a lab coat and have pocket-protectors? I think you could do more with the classic British boffin as a model, and a slide rule instead of a calculator.