Who's the artist? I want more.

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

With some sleuthing I think I found the OP

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

I don't really get how to browse Tumblr though I didn't immediately see any other of their works