Answer:
https://www.tate.org.uk/art/artworks/watts-hope-n01640
https://www.tate.org.uk/art/research-publications/the-sublime/george-frederic-watts-hope-r1105604
https://gardenofpraise.com/artprint12.htm
I’m pretty sure it was initial sketched or drawings
Answer:
analogous continuous monochromatic secondary.