I work in many different mediums...pastels, watercolor, oils, acrylics...and digital....it's all good. Usually it starts with an idea, to a drawing...then to whatever medium seems to be the best at the time.
It's not so much the medium as it is the process....start with the end in mind.
The process begins with the drawing.
I will use watercolors to tell me where the painting wants to take me...;-)