I gave up trying to find an original artist on this.
It is all over the net, including people making t-shirts on Etsy and elsewhere.
Hell, the one Etsy shop sells this same art with different themes so it is all but impossible to find a true source.
I was just happy to see Melkor on it and wearing his Silmarillion Helm.
I am a total Melkor/Morgoth stan.
I know. I’m sick like that.