Many painters will create pencil studies of their subject matter first to plan out the distribution of the halftones, shadows and highlights in their composition.
Many Realist painters find it necessary to create a complete pencil rendering of the subject before the painting begins.
The next step would be the color study that would help the artist plan out the changing values in the hues into their various tints and shades.
I have displayed here the rendered pencil study for the following acrylic painting.
This is the first painting I did that I thought worthy of showing anybody.