Practice in rubbing out
I did this as I’ve been looking at paintings from an American artist, George Innes. I used just 2 colours red and green, also linseed oil. Then most of the effects were done with kitchen towel, q-tips, cocktail stick and old bank card. Oil on canvas board.

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Yeah. Sure. Although it's not monochrome (using various tones of only one colour) it is still an image playing with light.