My favorite image of totality during the Great American Eclipse of August 21, 2017. Note the colorful prominences, the etherial streamers, and the rarely seen earthshine effect wherein the surface of the moon is lit only by sunlight reflecting off the earth. Earthshine is difficult to capture during a total solar eclipse because the light of the sun's corona is 100,000 times brighter than the new moon. Under these bright-sky conditions, the naked eye cannot detect the lunar surface detail lit only by reflected light from the earth. A camera's sensor can't capture both the bright corona and the faint lunar surface in a single exposure, but in this image I combined seven bracketed exposures using HDR techniques, thus allowing both corona and moon to be seen.

Nikon D810, Sigma 150-500mm lens, Slik tripod
ISO 400, f/11, 7 bracketed shutter speeds from 1/200 to 1/3 second, HDR processing using NIK HDR Efex software