Unfortunately a lot of Melkor art is…. Very anime and yaoi inspired. For some reason the first age and earlier is a hotbed for that.
I actually really like Tolkiens sketch of Sauron in the 3rd age
At this Point in time he’s thrown away any humbleness he had and is just this malevolent force in the world, fooled into believing he was Melkor reborn. I love how it’s just this black ash cloud in human form