David,
Scale has something to do with it. My heads are almost life sized and it is hard to get fussy when you are working on the scale I do.
I also use Goldens Acrylic Ground for Pastel which I tint and then airbrush with a matte liquid acrylic. The surface is VERY textured. I try not to smudge, and use a different color for each bit of skin.
You will get looser the more confidence you get and the pastel medium becomes more familiar.
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