So, their styles seem other-worldly, of the spirit-world.
No, not “of the spirit world”- but rather they have a sense of showing a world that the bible states when it talks about the unseen world where good battles evil- something that we dont see, but which exists (god showed one of the people I.n The Bible the great mu,titude of angels standing on the hillside in defense of the Israelites, which he hadnt seen before god revealed it to him).
Blake and Chagall just had a feeling to,their paintings as though they were depicting what they “thought” the spirit realm might look like- they weren’t drawing “power from the spirits” to paint. There is a distinction.