I recently documented my watercolor processes for my new Workshop Zines (read: upgraded handouts!). Below are two step-by-step photos from the Botanical Watercolor module. The first is the wet-on-wet technique applied to a single petal, and the second is its application on an entire flower, petal by petal.
I've opened a new Botanical Watercolor Workshop class for August 16. (The other classes have already sold out!) You may sign up at bit.ly/WatercolorWorkshops :)