It depends on the piece-- the size of a piece determines how small I make the brush. In this case, I was working at 300DPI. So when I was doing the fur, I worked with a 5pt round brush [40% hardness]; I also had the Transfer function on with Opacity set to "Pen Pressure" and the Minimum set to 60%.
I've been waiting for this . Step by steps are so interesting. Have you ever thought of doing Raikou and Suicune as well? I found that when I drew Entei it was a lot of fun to draw and so was Raikou. I hope you had as much fun as I did.