This little creature is referred to as a "sea butterfly," which is a kind of swimming sea-snail. I thought it'd be a fun thing to paint, and I think this little 6x6" turned out to be pretty cool! 
Now for sale in my Etsy shop
Now for sale in my Etsy shop
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Well done
And thank you! Sea butterfly is a new critter to me. Being the sort of person I am, I looked it up - - - turns out that thecosomes come in quite a few varieties. Pretty cool!