The other thing that is slowing me down is shading. I can draw you fake one-light-source shadows all day, but drawing actual shadows (or, at least, good enough fake shadows) scares me. My characters are very cartoony, but my tendency is to draw everything else a bit more realistic. It makes the characters pop off the backgrounds better. Bone is like this: the Bone cousins are very simple cartoony characters set against these amazingly rendered backgrounds, and it works so beautifully.
A page I had inked back in July was giving me some anxiety because of the shading. It takes place in a mine with a single light source, a lantern. Most artists can get away without doing exact shadows for any stories that take place during the day under normal lighting, but as I finished the panel, I realized an enclosed space with a definite light source needed appropriate shadows.
Here's the panel as it existed originally (though I had already started darkening in the tunnel here):
This is one of the pages I showed to Stan Sakai at the Comic Con, actually. He advised me to make the long black shadows there are appropriate for the lighting of such a scene. That was what made me anxious, because I didn't want to ruin the page. So, I scanned the panel in and started dabbling with it in Photoshop to see how it would look with everything darker.
It didn't look too bad, so I took the plunge and inked them on the page:
I think it turned out all right. I added a lot of texture to the ground and walls as well to continue the darkness. I still have a lot to learn about inking (the lines on the back wall aren't "classy" inking, they just get the job done), but each step makes the next less daunting.