I initially envisioned the little girl and her monster to be on a rooftop, but decided to put her on a hillside looking up at clouds in the sky instead:
I added some subtle shading in the bottom part of the hill to add a feeling of depth. I also used more than one pale grey for the clouds...again to add some texture and depth.
Next, I colored in the girl and the monster. Then, to make the hill look more like a natural part of the illustration, I added grass and flowers:
I drew in the stalks of grass by hand (digitally, that is) but did some cheating -- I only did a few sections, then copied and pasted those sections around the hill, altering the rotation a bit so it wouldn't look so obvious I was cutting and pasting. Then I added in some extra blades of grass here and there by hand.
Here's a screenshot of my layers, for those curious:
Yes, I love layers!
Next up: the fantabulous FRED KOEHLER.
I'm starting to blog about the process of creating I'm Bored (written by Michael Ian Black, illustrated by yours truly) with Simon & Schuster Books For Young Readers, for those interested. Included: photos, quotes, sketches & process info from the very beginning, working with editor Justin Chanda and art director Laurent Linn, through to finals and launch. I'd be delighted if you joined me.