It doesn't look like much because I've been putting 3 and even 4 coats of paint down before beginning the shading and highlights. My painting process (as it usually is) is to lay a flat mid-tone color down. Then come back in and blend a wash of light and dark tones to make it look 3-D.
I worked on getting the red squigglys done in the 100 degree heat today. Thank goodness for my umbrella but I was still sweating as much as I drink.