are you seeing the animated images on imgur? maybe I overestimated apng support among web browsers. here are the same images as lossy gifs:
https://imgur.com/a/vhijSsk
the one with checkered eyes, patchy glow, glowing casings and stray pixels on deathguards and skull's teeth - is a screenshot of the original
indeed, the fullbrights seem intentional, so I fixed them to the best of my ability