And here is an illustration of Melkor, Sauron and the other lieutenants ;
Gothmog (I am not inspired by his version of the film / this is a lord of Balrogs still, it must be more impressive)
Ancalagon, father of winged dragons/ Black dragon
Glaurung, father of dragons earth;
Carcharoth Lord of the werewolf;
I have not read all of them, but I look forward to learning more about them.
Watercolor/ A3/ Silmarillion/ Tolkien.