Paint a model that has a single or double dilution: Buckskin, palomino, Smokey black, cremello, perlino, smoky cream. OR if deco is more your style, paint your model pastel colors. Any medium as long as you use the pastel version of a color(pastel pink, pastel green, pastel blue, etc)
I chose to do a Breyer SM Driving Horse (trotting warmblood?) that had sculpting work by Heather Kapica and make her palomino.
This horse gave me problems too - the pan pastels and sealer lifted on his chest, but I managed to fix them. He turned out okay I think.
So another monthly challenge down!