When I saw this picture I was confuessed at first but when i read the last pannel. Ever though the picture will go great with a song like for example Try by P!nk meaning to nevr give up on things in life you fall down, and what do you do? You get back up again and try again.
This is a emotional, beautiful piece of art for the show. We can see this happening in a future episode of Gravity Falls.
When you put the lines "I'm not just a kid..." it makes us feel when WE were just called kids and make us feel bad for Dipper. I also love the details, colors, and background in this. Makes it feel more show accurate. I would imagine the "plot" of the comic on how it started. It would actually be a great idea for a episode of GF.
This is very well-done & beautifully drawn. Keep up the work.