Put a wet wash down in an oval type shape.

Add some light yellow, yellow-orange to the wash. Naturally let the colors mix. If you try to be perfect or overwork the watercolor you will be sad.
Dab in a little wet orange watercolor paint.

Let dry.

Once dry, begin to paint part of the trunk and a few branches. Try to create organic lines and they do not have to be complete lines. It is best if they are broken up a little.

In the trunk, take a little water to make one side darker and one side lighter.

Let dry. Take a larger brush and dab more saturated reds, oranges and yellows. The saturated colors are achieved by having less water in your brush. Using a paper towel and testing it on a side paper may be helpful.

If desired, you can even add a more saturated color to the edges or underside of the branches to try to create a more 3-dimensional feel.