While waiting for a GtoM to start I played with my 327 Chevy motor. Straight PS layer comp, not a blend. 3 layers- toon, raw and a vignette backplate (no model), in turn heavily vignette in Settings. Toon layer @ 75% transparency. Noisy Drop Shadows.
Dang- gotta get back to work! I will say that SIGGRAPH had better plan for a dedicated KeyShot Pavilion just to handle the crowds!
Bill G