This pastel was worked on Pastelbord, one of my favorite surfaces. It was basically worked in three stages as follows.
The pears were sketched onto the Pastelboard with pastel pencil then basic shapes were "filled in" with Nupastels, a harder type of pastel stick. I'm not fussy at this stage with detail - basically, I'm concerned with values, getting the light correct and the basic colors down.
paint the complement of each color and let it show through the soft pastel on top.
In the last stage I use those gorgeous soft, buttery soft pastel sticks (Unison, Sennelier, Terry Ludwig) to add color and make refinements, and the finished painting is shown at the top.