Color Study - Tree

Ultimately, the goal is turn the reference photo this was based on into a pastel painting.  However, I needed something to paint and decided to try a color study.  The orange leaves of the tree are a mix of alizarin crimson and quin gold (which I am finding is a versatile color). I muddy up the tree a bit, I am too impatient and need to let the color dry and use a wet-on-dry technique.  

                                           Watercolor on paper 10x7