I’ve never even thought about wall art in a workshop, but machine tools I think look better in original or close colours, bright machine tools look a bit gaudy imo.
Your lathe looks like ral 6011 reseda green which is a nice colour, paragon paints has lots of period correct machinery colours, this greyish blue colour I painted my union t&c grinder isn’t original but pretty close, just try not to paint machined surfaces and over screws and bolts, it looks terrible and is a hindrance especially gib adjusting screws etc I don’t know why people do this it’s like painting the face of a hammer.
I do like bright automotive handtools though it helps to stop losing them in an engine bay.

