Here’s my headcanon for what Kriem’s mask is hiding ._.;;

Not the best depiction, and all his arms are down because he’s ashamed, but usually they’re raised and look a good bit like trees, his eyes, as I’ve discussed before, are multiple colors that move like smoke, but his tend to stay toward red and purple. The shape of his eyes, and prominent teeth carry over into his masked appearance
It’s not well illustrated here, but the entire form (not the mask he’s holding) are the kind of consistency Clayface from Batman is, and the flesh tends to be semi-translucent, and can be any color (his is reddish)…
I think that’s all I have to add?