You could paint snails, but these come with their own DIY paint job already done.
Squirrels seem like they would easy, but they are a fabulous assemblage of curves and textures. There is the smooth, slicked back hair that looks of Brille Creme but is natural. The tail has the fluffy look of well spaced long hairs that look like squirrel rubbed his feet on a carpet. When sun hits just right, the tail is illuminated in an almost ethereal way.
Eyes that look glassy, and sharp pointy claws on fleshy little hand paws. Squirrels are a great little collection of creative delights.
By now, everyone knows my favorite insect.