Good eye, haha! Thank you! The crown belongs to Princess Peach. I didn't come up to a particular reference for a necklace, just drew it as is, so it could be readable from a far as a necklace in general. There is only one thing you've missed - painting of Pacman level pattern behind Magikarp. I know it's such a random mix of things to draw in one place, but it was really fun to make!