Just seeing this thread now, but that Symphony X cover is the first thing that came to mind upon seeing it. I played a lot of video games with cutscenes that looked like this in the late 90s so that one really struck a chord with me.
I'll go ahead and submit the original cover for Faces of Winter, which was widely (though not entirely) panned on the FB group when I first shared the album. It's a watercolor painting that I made, and despite the reaction I still like it. But obviously I cared enough about the perception to change it (twice), first prior to uploading the album on YouTube/releasing it on cassette, then again when I started working with Canrith. I think if I were releasing this album right now, I'd be pretty confident in using art like this, but at the time I was not very confident in my visual sensibilities.
This one is kind of interesting - Bernhard Gander, a modern classical composer who is seen in his bio photo wearing a Napalm Death t-shirt, and who from a distance has pieces that might be mistaken for experimental tech-death. Most of his album covers have either weird CGI or manipulated photos with some imagery that is pretty rooted in a metal aesthetic. To my knowledge he's the only composer in this field with a visual aesthetic like this.