Multiple plate Aquatint

I'm starting my first Multiple plate aquatint. A multiple plate aquatint is when you have different plates for different colors. If you were to do one plate, you would be limited to one color. First I drew an image from a photo, and etched it onto the plate. I'm also using photo reference for the colors. Here is the soft ground line etching.

I'm using three plates for this process, red, yellow, and blue. My key plate will be blue. Next week I will start the red plate and create different values with aquatint.