Each update to Succubus Stories is accompanied by a piece of promotional artwork. The game also periodically gets new store artwork and banners. You can find a collection of high quality past and current versions of the artwork here. Some also have uncensored versions!
The following is promotional artwork that has been released alongside updates.
Artwork used on itch.io (and elsewhere) to represent the game.
Banners used on various websites and store pages related to Succubus Stories.