Watercolor Grid

Below is one of several possibilites the grid can offer.

Below illustrates a step by step process.

Begin by drawing out a grid onto your source and the surface you plan to work on. Make sure the paper wieght you use is 140 lbs or higher

Below I cropped the image at 9 x 7 inches. This gives me a round number to work with.
On the sheet to the right, I marked a grid every 1/4 inch.
On the larger sheet I measured every 1/2 inch to double the size of the original source.
Number and/or letter the diagonal and vertical of the grid as demonstrated below.

Using a limited palette (ultramarine blue, cadmium red, cadmium yellow), mix and match each color using the square color's properties from the source.
Remember how to mix color by using complements (opposite color on the color wheel) to desaturating a hue's intensity.
Ask yourself the properties of each square's hue.
-What is the name of the hue? The name of the color on the color wheel
-What is the intensity of the hue? High, medium or low?
-What is the Value of the square? Dark, middle tone, or light? Imagine taking a black and white photo of the square. What value does the square translate to?
Eventually this process becomes habitual and natural.

You do not have to work in any specific direction (left to right, or up to down). What direction you are comfortable with should not undermine the final image.
Just remember not to paint a square next to a square you just painted. Allow the square a moment to dry, otherwise you will bleed one square into the next.
A main characteristic of this project is how each isolated square differs from the next, but works as a whole to represent a form.

As the image becomes smaller (or you walk further away) the subject matter is more recognizable.

A finished version.