I'm working from a sketch I did which had -- wrong! -- the stone of the monument whiter at the top. It's not -- the "white" marble is two colors and the top is definitely a yellower stone. I'm going to play with the color a bit as this painting progresses.
The limitations of my set up: I am up on a step stool to paint the upper part and I've gotten just a bit of paint on the ceiling since the canvas is wedged up against it. I have to get onto the floor to paint the bottom. I've been thinking I could separate the canvases so I could work on them all at normal height, but I need to see the work as a whole, so I will suffer for art.