I though these might be of interest to those wondering what process I used on these images. There are hints of other directions and color choices, and generally just a bunch of trial and error. Generally each shot represents and hour or two of progress:

Have I mentioned before that sketches aren't my strong suit? XD

I often pick use a photographic backdrop, and use it's characteristics to start planning the layout and lighting. Added flat color over the sketch.

Starting in on shading, and getting a sense of how lighting affect the scene.

Rather large jump here (probably an entire evening), where I've nearly finished over-painting the sketch and experimented with feather and scale textures.

Deepening the texture on the body, adding more color and distress marks. Added a grease tank as a new commission suggestions. Added the forground layer with out-of-focus bacon piles and tractor for depth.

Krown pointed out a lack of belly scutes/scales, so I started experimenting with some leathery "overstretch" gaps.

Shifted the color palette to a more neutral tone, adjusted the perspective on the tractor bucket.

Testing a more saturated palette again. Extra highlights. Adjustment and detailing around the hind foot.

Extended the left side to center the composition. Stretched the grease tank horizontally, and adjusted the text on it.

Finish detailing around the front paw and head. Another tweak to the palette and shading, and the tank text.

There was always a question of how the owngon was getting that grease.

The concensus was that more would be better. And why not some gas?

Some more mess, and a shift to a less "ghostbustery" look on the gas. Tah dah.