It is a mixture of various art styles, but the overall feel is soft, pastel-colored, and translucent, with compositions leaning toward modern art. It is difficult to describe in words, so I think you will get the idea by looking at the reference examples:

Version 20 is stronger and more intense, and combining it with other versions may cause issues. Version 15 is milder in comparison. Since it mixes a wide range of styles,I've separated them into trigger-word categories for your reference.