Played around a little with the camera and light conditions. I took some comparison photographs of an Ivory and a Cinnamon Yellowbelly Paint. I did use a custom white balance (on the camera) for these using the WhiBal card. I kept the settings in the camera the same, ISO 200, f6.3, shutter speed 1/320 of a second. I took a picture outside in direct sunlight, a picture with my wife holding a diffuser in sunlight, a picture with my light kit, and a picture with my light kit and two reflectors. Here are the results.

A quick picture showing the diffuser being used:


Outside shots (they were so over exposed, that I adjusted the exposure by -2.5 in Lightroom trying to get the Ivory to show up)


Here is the light kit with and without the reflectors:


And here are the outside shots (no exposure adjustment) next to the light kit shots.


Let me know what you think.