I may not post on tumblr anymore, but there is still some good left in that site if you look hard enough. There are some fantastic Japanese illustrators I’m a fan of who still post their work there.
One of my absolute favorites goes by the screen name “rt0no”. (They also have a pixiv profile.) I love their character designs, and their illustrations and ideas would be right at home in a Guillermo del Toro film! Below is just one example: