In my opinion the more the merrier. There will be a pile of them by the time I've finished! This is going to be an A3 pastel painting.
I was lucky to meet these guys last year, sunbathing in London zoo. The otters fur is so sleak and glossy, the painting has the otters entangled, heads resting on heads, backs and bottoms! All the otters are in bliss, sunning themselves!