Here the abstract noun "likeness" means that what Ezekiel saw looked like these things. Both "likeness" and "appearance" are abstract nouns that can be translated as verbs. AT: "As for what the living creatures looked like, they were similar to burning coals" (See: [[rc://en/ta/man/translate/figs-abstractnouns]])
Lightning flashes and then disappears quickly, and the creatures moved from one place to another quickly. The abstract noun "appearance" can be translated as a verb. AT: "The living creatures were moving swiftly back and forth, and they looked like lightning" (See: [[rc://en/ta/man/translate/figs-simile]] and [[rc://en/ta/man/translate/figs-abstractnouns]])