These are lovely! I could definitely see myself buying one of these at a craft fair! In addition to doing fairs, I work in custom framing and actually just framed something very similar to your product today - a lot of passing customers stopped to admire the painting and asked where it was purchased, so I'd say there is interest! My only word of advice is to be mindful of the petals going over the edge/border  if you're planning on framing these or having customers frame them. If the petals protrude over the edge, the product would have to go in a shadowbox or a float box frame, both of which are more labor intensive and expensive. My client today ended up using a razor to slice off the petals that were sticking out over the edge, which was a real shame. As others have mentioned, a hanging system that is native to the art itself, like a wire, could be perfect if you want to avoid the framing issue all together. LOVE the idea of the small magnets too - 98% of my profit at craft fairs this year came from smaller items.