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Placing an NSFW warning for any links to DeviantArt would be overkill, as the site contains way more content than just that (and has an filter that you have to register to get through, if I remember correctly). If the specific artist has such content on their own page, though, then yes, a warning might be warranted. Note that "racy" is not necessarily NSFW; there are degrees of this sort of thing.
"It's Occam's Shuriken! If the answer is elusive, never rule out ninjas!"

Would it be okay to add warnings for links that could be potentially NSFW but nothing explicit?
I would like to add an example to Super Smash Bros. Ultimate under Hilarious in Hindsight that involves a link to deviantart (You can already tell where this is going) and the link contains some....fetish art. Would it be ok to add a warning for any readers who might click the link as it could squick people if they're not prepared or into it?
Side note the picture itself is fine but the users page contains some racy art so would it be appropriate to post a link with a warning, just the image itself (which I'm hesitant as it doesnt give the creator credit), no link at all, or just axe the example altogether?