Highlights and accents
Reflections and highlights are fun to paint, but they can be distracting to the viewer if you’re not careful. Keeping specular highlights on a separate layer as I paint enables me to adjust their intensity and position without messing around with the matte surfaces underneath.
Use of big shapes
I see good composition as a series of large shapes that direct attention to a series of smaller shapes. Once I think of the background explosion as a larger shape, it’s obvious that I need to group its values together so it redirects attention to the smaller shapes in the girl. So I paint orange over the area using an Overlay layer.