The second DLC for Back 4 Blood continues the themes hinted at in the first DLC, Tunnels of Terror seen here:
https://www.artstation.com/artwork/r9ZXEO
For Children of the Worm, we see more of the cultist influence and how some of the world has been repurposed since the collapse.
Art Direction:
https://www.artstation.com/mikebrainard
Lighting:
https://www.artstation.com/norbertvarga895
Environment, level art, & design:
https://www.artstation.com/ianrunnels
https://www.artstation.com/tivoli
https://www.artstation.com/pipesfranco
https://www.artstation.com/brentgriffith
https://www.artstation.com/jafo
https://www.artstation.com/richardrude
https://www.artstation.com/brookeolson
https://www.artstation.com/jakevirginia
https://www.artstation.com/dallanpickard
https://www.artstation.com/theburger
https://www.artstation.com/alternateground
https://www.artstation.com/phillgonzales
https://www.artstation.com/lamotterudy
Character art:
https://www.artstation.com/alexboatman
https://www.artstation.com/jchavez21
https://www.artstation.com/elliotb
https://www.artstation.com/jhill
Weapon art:
https://www.artstation.com/bradboyles
Animation:
https://www.artstation.com/chazamation
Concept art: