In any painting, when I like my progress, I get more anxious as I work to finish it. Will I screw it up? With acrylic that's especially dangerous because it dries so fast. (I can paint over it, but it's tough to match colors when doing that.)
So I sketch in proportions and such with a light color and set it up for the bolder brushstrokes and colors.
You can see the girls, faintly marked for the final strokes.
Oy! This is why some of my paintings don't get done until late night / early morning. I get too wound up to walk away and get a good night's sleep.