Two-color Study

For the first painting I've done just for my husband and myself, I decided to try a two-color adaptation of a wedding photo taken by my good friend Decima. I'm fairly happy with the results.

Worth another go at two-color, I think.
I used Alzarin orange and Ultramarine blue. Oh, and a little Chinese white when I needed to modify a stray brushstroke.

Watercolor Process

I was asked by an old friend to show her how I paint. Since she can't watch me do the actual brushstrokes, I decided to photograph a painting in its various stages of development and post them for her to see how I do what I do.
Any readers who know how to paint with watercolors for real, please tell me what I could do to improve. As always, I'm just painting "by ear," and I'd love to have some informed advice.
So here is how Joyce and her horse got to be painted:

The sketch with initial wash

My workspace