I don't have any pictures to share, but I think a necklace and earrings can be worn at the same time provided that only one or the other is a "statement". So, if you're wearing gigantic bedazzled chandeliers, maybe leave off the necklace.
Come to think of it, I wear a necklace and earrings quite a lot, because I never take my earrings out. I have a cluster of small hoops in each ear, and I feel like they're an extension of my body. I wear a necklace some days and because the earrings are small, it doesn't interfere. Mind you, I've got wild wavy/curly hair that's cut in a sort of layered bob, so it often covers my ears.
Also, I don't wear glasses. Do you? That might change the equation, because I feel like most glasses (except perhaps the rimless ones) count as jewellery.