More Exploring Without Color

Still having fun experimenting with black and white pastels.  I'm looking for the value of my reference material instead of color. This gets me thinking differently in the sketching process.  It is fun to learn something new and develop ourselves. Below is the first sketch that served as a learning curve for the animal and the lights and darks. The second image is where I took the piece on black paper using white pastel and charcoal.  

"Bobcat"   9" x 12"   Pastel  

"Bobcat"   9" x 12"   Pastel