The Disasters of War 13, 2007. This one is also oil and acrylic on canvas, however its 180cm x 125cm. This series is in memory of Francisco de Goya.
Head of a Child III, 2000. This one comes in at a whooping 299cm x 218cm. Wahhhh?! The details are just insane.
Here's a portrait of the artist working on Kindskopf. This gives you an idea of how difficult working on these paintings must be. It's nearly impossible to get details like that on a painting a quarter of the size of these. Go check out his website- there's a ton of other stuff to marvel at.