Hello, @riasnelli! As @joyously mentioned, a 404 HTTP response is expected in your case. As for SEO, an image tag that throws an error code could possibly affect your SEO if it is the featured image.
Simply replace the image in your post editor by uploading a new image and you should be good to go!
If this doesn’t answer your question, please elaborate further and provide relevant screenshots. Thanks!
Yeh, I replaced the image on the post and I think I’m on the right way.
Thanks, @sarmstead @joyously
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@riasnelli, glad we could help!