background art
Refers to painted or designed backgrounds in animation, games, or film, as opposed to character art.
The background art in this anime is very beautiful.
He works at a studio as a background art specialist.
背景 is a general term for background or setting, while 背景美術 specifically refers to the artistic creation of background visuals in media.
美術 means art in general, whereas 背景美術 is a compound specifically for background art in visual media.
Compound of 背景 (background) and 美術 (art).