Landscape Oak trees 9"x12" pastel

I am trying to learn something new. Not sure what yet. I am using pastels, to see if they will be easier to take with me when I go someplace to paint. at first I thought they would but now I am not so sure. Anyway I am working with them and I am for sure learning more about color and value. Learning to see more and better. Still life is the easiest way for me right now. In landscape the light is always changing and so then so is the color and value. On a still life it stays the same, and only I change from day to day.