Step 1: Begin your artwork
Plot in the shape with a light colour like yellow. You can start lightly and as your move to darker colours like oranges and red for tone you can start to press a bit harder and really bring out the dimensions of the pear. You can draw quite roughly with the pastels, there is no systematic way to do it.
Step 2: Painting with oil
Now dipping your brush into the oil, start to paint over the pastels, starting with the outline and then the bottom of the pear to bring out the shape.
Step 3: Deeper tones
You can now take the pastels in deeper tones of red and colour over the oil. The oil will make a nice base for the pastels and they will glide nicely of the paper.
Step 4: Blending
Paint more oil over the pastels and blend the deeper toned pastels with the warm base colours.
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Step 5: Definition
Adding some blue tones now will help to define the curves of the pear and really make it three-dimensional. When you are happy with the amount of definition your artwork is complete.