Painting Number 4

A little behind the scenes note on this painting, it is a REALLY hard painting to photograph.  I used pure white for the background - (click here if you'd like to see a close-up of the white impasto on my facebook page) and when the image is exposed for pure white the color fades away.  This isn't the best reproduction of it, but there will be a better reproduction of it on my website in early June.  Just a note - this painting was painted using only three colors, plus black and white.   Can anyone guess which colors - here's a hint, they're made by Lukas. . .