User blog comment:HalfwayDead/Season 3?/@comment-31451244-20170728093149

The picture is just a fan art

And the creator (aka Alex Hirsch) said there wasn't season 3. He decied to end the story and let it be a series with a begining, a middle and an end

https://shmalexsmirsch.tumblr.com/post/133619326491/goodbye-gravity-falls

But there's gonna be GF Graphic Novel next summer