A Blush that covers the whole face, rather than just the cheeks. Occurs when a character is really Embarrassed.
It's not a full-face blush if it doesn't extend past the cheeks. The blush should reach at least up to the forehead and down to the mouth.
If it only covers the nose and cheeks, it's a Nose Blush instead. If it extends outwards to the ears, it's an Ear Blush instead.
