This is a thing now. I had a sketchy picture of my hubby done on black paper. I’d used pastels to do the drawing back in September, but after playing with nail varnish to draw a landscape view, I decided to use them on the drawing. It certainly had an interesting effect. It’s shiny and the colours change depending on where the light bounces off. I finished it off with adding a few lines with a silver marker pen. It reminds me of oil on water.