I don't need to have yellow ocher on my palette because I can just mix that color, but it makes much easier to have ready to go. I use yellow ocher in many flesh tones. To mix browns such as burnt sienna and burnt umber I mix different amounts of cadmium yellow, alizarin crimson, and ultramarine blue.
Value is color. In other words yellow already has a value with it.
I painted with my Grandma back in April. She wanted to paint the way I do, so she payed me for some lessons. We painted my brother, Andrew. It was great that he was willing to pose for us.
Above is the end result. My painting is the one on the right and her's is the one on the left. She has worked on her painting since and it looks a lot better. I was emotionally done with my painting after this day. I looked at it more as a sketch and not an official painting.
Above is a picture of when I painted with my friend and mentor Mitch Baird in West Linn, Oregon. He has a brilliant website at: http://www.mitchbaird.com/. I have learned so much from him. The above picture was a head painting session that took three or four hours. We painted my friend Jennifer. She was so awesome about it! She posed for free. My painting is the one on the left and Mitch's is the one on the right. This piece I was working on seeing the main shapes and then add detail later.