After compiling several different pieces of photo ref for the leopard's spot patterns (there was no actual photo ref for this pose) I drew the patern out on a piece of tracing paper I laid over the cat figure. I do this because I know I'm going to be erasing a LOT during this stage. Spot patterns are a pain in the ass as not as simple as they appear. After I'm sure I have them correct I rub graphite on the reverse of the sheet and use a hard (7H) pencil to transfer them to the final painting. I then render them with Ivory Black to set them so they don't get lost in the next few stages. This can also be done in Raw or Burnt Umber.