Might be here, Tumblr is a bit of a dick so you can't browse without making an account. But this person was given credit one of the times that image was posted, so hopefully that's correct. They also have a red bubble under their previous Tumblr name and have the same image.

https://roselalonde.tumblr.com/post/183429971135/conversations-with-my-sisters-cat/amp

https://www.redbubble.com/people/cairo-overcoat/works/37661245-all-cats-are-baby