After many years of painting spots, I've found what works best for me in creating the illusion of fur.
Keep in mind that this painting is 24" X 36" so the leopards are relatively small.
As you can see with the leopard to the left, my overall turpentine wash (Rembrandt yellow ochre and turpentine) was heavier overall on her than the lower part of the painting. After the base dried I went back in with a more concentrated yellow ochre in the wash and applied it to the spots. This can be a little sloppy (not staying within the lines of my drawn spots) as it is meant as a color base. I let this turpentine wash completely dry (usually 1 day) before applying any oil paint.
I do not own any black oil paint. On top of the yellow ochre wash for the spots I like a mixture of Rembrandt ultramarine blue, burnt umber, and burnt sienna. The percentage of each varies depending on whether the cat is in sunlight, dappled light, or full shade. If I want a lighter spot (maybe in furrier chest areas) I'll add some titanium white, use very little paint on my brush, and dry brush it on.
I'll be adjusting the color of the spots further once the background color is applied and the dappled light is established.










