Here’s one of my recent pastels on black velvet pastel paper. I used soft pastel sticks (Rembrandt and a cheaper brand that I don’t remember) and Faber-Castell Pitt pastel pencils. For many of the stars and clusters, I used sandpaper and sanded some of the pigment from the soft pastel sticks then gently poured it in a concentrated area on the paper. Most of the blending was done with my fingers but I did use a blending stump a little.
(Note: I tried to upload a video that shows the creation of this but it was too big! LOL!)