Butterflies look strange without their wings! The Thorax hair isn't quite right, and the white spots on the underside don't show up as well as I'd like. Overall though, it's a bug!
If you're wondering where the other two legs are, they are tucked up against the front of the thorax. Butterflies mostly use the back two pair of legs, so I made the front ones non-functional, just like in real life. You can also see the rolled up proboscis at the bottom of the head, used for sucking up juices from flowers and such.