The is a concept of a sci-fantasy creature that floats in a planet's atmosphere; commonly referred to as "Sky Puffs".
Filled with a gas lighter than air, they are carried around by the wind. While they do have wings, they are only good for stability, not propulsion.
This is the very beginning of visual development for a personal sci-fantasy story. Much more to come
Other work from this series:
Monolith Desert: [link]