Here's another couple of inked background designs for the Gravity Falls pilot episode. This one is a huge vertical pan where Dipper descends down into a dark and mysterious gnome forest!
This here is a big horizontal pan of the gnome forest. A bunch of gnomes have Mabel tied up in the foreground just there.
These final inked drawings are super time consuming but once the background painters get ahold of them the results are often quite spiffy! You can see the final statements on Elle Michalka's blog