I had a need to make a wedding congratulations card, and since I didn't feel like painting something with boring rings or flowers, I did this. I'm quite pleased with the colours. It's mostly burnt sienna, Azo yellow medium and ultramarine blue - the grey of the trunks is a mixture of burnt sienna and ultramarine, with a bit of titanium white, and the lady's hair is the same mix, just a little heavier on the burnt sienna, I used a tiny bit of yellow ochre for the person on the far side's hair and trousers. The outlining is ultramarine blue too.
Why all the detail? Well, I came across the xkcd colour survey and was alarmed by: