It's about smiling. Ear-to-ear smile or grin is when you have a very broad and generous smile. Such a smile when each corner of your mouth is by each of your ears.

a cut from one ear to the mouth to the other ear, in other words a chelsea smile

Disturbing, unnecessary, often flashy and distractive pieces which some people confuse for decoration on their faces. Sometimes hang from the side of a face further contributing to the disturbing distraction.

The organs that detect sound, placed somewhat symmetrically on opposite sides of the head for humans.

An organ used by humans to estimate the stupidity of other humans

Jewelry to ornament the ear; usually clipped to the earlobe or fastened through a hole in the lobe.
An ornament worn on or hanging from the lobe of the ear.

ear