After being granted my sketch from this year's Halloween Sketch-O-Thon, I spent the day finishing it up:
Used this to practice cel shading, shadows, backgrounds, and, of course, the tree. I don't know how to draw trees, so that's my current best. Also, big thanks to Tower for advice on where to improve the shading.
If I had to come up with some context for the image, it would probably be something along the lines of a senseless but worryingly likely to work plan which requires a pumpkin that is Definitely Not Haunted*.
*Not-Hauntedness not guaranteed, and especially unlikely during a full moon and/or Halloween.**Okay yeah it's haunted, but he doesn't know that.