This is exactly my point of view. I never have had any use for paintings made from photographs. If you are too good to have a photograph hanging on your wall you can have a painting created from the object but, if it is a mechanical conversion, why not just make a large print of a good photo? Photo and frame proportions have always been a problem. You can always have a custom frame made to fit what you have. You can adjust (not distort!!!) what you have to fit the frame. There are several ways to turn a coin into a decor item whether the medium is photographic or drawn. Each of the below is the same proportion as 'Costco' normal 20x30" or 4x6" but could be done to fit any frame if you use care to match the coin to the other elements available. Not every coin crops well or stacks well. Most will overlay on a map. The hard part is the deciding what you like. The easiest is to extend the background to fit your frame but the others probably make a more splashy wall hanging. Large wall 'art' can be a group of smaller coins or one particularly fine detail from one great coin. Those of you who just bought a high end owl tetradrachm might want a close crop of only its best feature (you paid good money for that detail, use it). I am not the owner of a new hoard perfect owl so mine has flat feathers. Your could look good on the wall if you have been practicing your photo skills or can get a good image from your dealer. Some of them do very good work worthy of the wall. Those with smaller budgets like me might find some beauty in the dirt that covers your coins. Just look for the good parts. These photos are reduced in size for web use. Always make wall prints from the largest files you have available. If you have no good photos, perhaps the paintings will be more pleasing so I guess that is 'why'. Actually, yes. I prefer wall art that shows the interests of the residents rather than some generic painting of a random scene. Fortunately, my wife likes birds, turtles and lighthouses rather than handbags.
My wife likes our collection; as posted, she chose the coin. She suggested we hang it near the front door. She doesn't like handbags or shoes; though I wouldn't mind taking a picture of one of her more elegant pieces of fine jewelry to hang on the wall. I think you may have mistaken my wife for a cliche.
No.... taking a photo of a prized possesion and framing it on canvas in a house would be a cliche. I was just making a comparison to show how insensitive that may be to other people who cohabitate. I had no pretences of knowing what your family does like or dislike. I was just using examples to make the point that was not taken.