I talk about the illustration and the passage it's illustrating on the Picture Book Report, so I figured on here I would show my process...
Often when I'm first trying to puzzle out a layout, I sketch quickly into photoshop with just black and white until I get a vague idea of what I'm going for. (oftentimes this involves me erasing everything or deleting the layers afterwards when I know what I'm doing, which is why I don't have that to show you!)
As you saw in the last post, once I got the idea of Sabriel turning in her chair in the study, I started with some photo ref to set the groundrules.

Oftentimes in my editorial work, I will go straight to color after thumbnails. Since this was going to be a little more complicated, I worked out the general layout in B&W first. I've been looking at James Gurney's tips about tone & composition and Maxfield Parrish's B&W work, and I was excited about the idea of Sabriel's head being silhouetted by the fire.

From there, I worked out the colors. I imagined the room being dark and warm, that's where the tans come from. I tried out a really blue room too, but that ended up looking less elegant.

Aaaand then most of the rest of my time was spent clarifying all the details, color tweaking, rearranging things, and adding decorative elements!

Finally, I added different texture layers and final tweaks, like the outline of light or shadow on different surfaces and some detail on Sabriel's skin.

Voila! It's certainly a bit different from my very flat work, but I'm interested in where it's heading. Stay tuned for more in the future!