YouTube can be dangerous to my pocketbook. I watched a few colored pencil tutorials there a while back, and one suggested combining soft pastels -- specifically a brand called "PanPastels" -- with the pencils. The idea was to use the pastels to cover larger areas, and for smoothness. So of course I had to check them out.
I was delighted to find a portrait set to test out, and it came with application tools. Those things to the right are sponges, and you slide one of the smallest ones onto that blue implement. Then you dip the applicator in the pastel color and brush it onto your surface.