These are the alchemists. Not your typical wisened european chemists but men who are following the Great Work in various ways. This guy is more of a blacksmith, with protective leathers due to explosive endeavors. He has already lost a leg but still gazes deeply into his creations.
This fellow below is inseparable from his bopkin. He is selfish and dangerous.
This one is just a blue sky attempt - alchemy on an alien scale. Human ingredients are needed. His pose is reminiscent of giant buddhist statue, perhaps they used his form as a model. He has humanoid anatomy on the outside but his pose has no counterbalancing, inside he is boneless. His clothes are perhaps a crabs casing. Giant voodoo alien alchemist?
Concept artist and creature designer.