Here's a photograph:
Next I convert it to black and white - then I'm not distracted by the color.
I make a quick sketch of the darks only with a fat felt tip pen. If they make an interesting pattern..I'll follow that in my art work. If the pattern of darks is boring...then I'll tweak it a little. You can also see see if there are any major mistakes with balance, or rhythm. I find the position of the lights much less important...the weight is with the darks even if they're not all that apparent when the piece is finished.
and now I'm ready to make art!!! Stay safe and healthy - making art is not dangerous and you don't even need to wear a mask!! And, if you have been, thanks for reading...and please comment and tell me your working method...I'd love to know. elizabeth