Inspired by "Scarface", a client has requested a scary Mr. Winkle. He also asked for two different colored eyes... one blue, one red. ("Scarface" had two red eyes). My customer also encouraged me to have some fun building the spooky old guy. So I clipped a single strand from a medium-sized house-painting brush and dipped it into cadmium red acrylic paint. I dragged the strand across the white portion of the eyeball to get the bloodshot veins in the red eye.
And yes, it was fun!