SCP: Unity's Concept Art has been created by both developers for the game and fans of the game. As the name concept art implies, it is a piece of art used to represent what an SCP, zone, etc. may look like. Of course, these concepts are often subject to change when the SCP, scene, etc. are finally implemented into the game. Do keep in mind that this is not a page for the game's fan-art, but a page for concept art that is intended or was intended for defining how the game will look.
SCP-939's concept art by Apocryphos
SCP-1057's concept art
Scrapped concept art for SCP-682, SCP-1499-1, and SCP-1013
SCP-049's concept art by Pixel Puffin
D-class concept art by Pixel Puffin
Flame Unit MTF concept art by Pixel Puffin
Scientist concept art by Pixel Puffin
SCP-106's concept art by Pixel Puffin. This concept appears to be unused.
D-class concept art by Pixel Puffin
SCP-173's redesign concept art by Pixel Puffin
SCP-173's redesign concept art, focusing on the arms, by Pixel Puffin
Scrapped concepts of SCP-173's redesign by Pixel Puffin
Scrapped concepts (with design F appearing to be a WIP version of the final concept) of SCP-173's redesign by Pixel Puffin