This is the sketch of my initial idea.

I do this on parchment paper so I can make corrections and adjustments before transferring the image to watercolor paper.

At this point I paint the underlayment and the "soul" of the animal or person.  It seems to bring the painting more to life when I do.
Now I start layering color.  I have a tendency to work from top to bottom in my paintings. 
I've layered more color and added the smaller image from the clients photos.  i will be adding another image in the upper right to further define the character of this springer.
The final picture.  .