This hand-painted Bosch figurine, Egg Monster, is from Hieronymus Bosch's painting The Last Judgement.
Amidst the many unlucky ones who are speared, ripped open, strangled or even fried, the monster in the egg that has been shot by an arrow, steps jovially into the middle panel. He appears to be detached from his entourage. Meanwhile, his fellow monsters are painstakingly going about their core-business: carrying out the merciless delivery of the final punishment, for us sinners, in a most inventive manner.
This Bosch figurine is one of many available from the National Gallery.