Gods, mortals, action, romance, leopards, snakes and severed deer heads! (Not to mention a beautifully dramatic landscape and delicate foreground flowers rendered with botanical accuracy.)
[Addendum: not to mention lots of genuine Ultramarine Blue, made from a semi-precious stone more costly by weight than gold. See the full pigment analysis on ColourLex.]
In the National Gallery, London. Use fullscreen and zoom controls at right of image.