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"OMG SHIVER CONCEPT ART" no. That is just a Octoling Adaman from Pokemon Legends Arceus.
In the art of Splatoon book, many concepts for the Squid Sisters can be seen. One of them being lineart of these designs.
When scrolling through Google, I found an image of a Splatoon exhibit in Japan which feature a full colored render of this lineart(...)