Here's a new ACEO that I'll be listing on eBay tomorrow. It's called "The Dance"... I've been doing these figures for about 15 years now, but this is the first one in paint. I usually reserve these forms for inks or colored pencil.
This is painted on 140# (300 gsm) watercolor paper and mounted on acid free matte board. It was painted with gouache and is the standard 2.5 x 3.5 inches.
For those of you who don't know what gouache is, it's a wonderful form of opaque watercolor. I've grown quite fond of it for it's portability. My pallete will fit in my purse with precut ACEO cards and I can paint anywhere!