With a light table and a couple of Zig pens I make this inked version of the picture. I also used a somewhat dried-out Micron brush pen to get the largest areas of black.

I start off by laying in the base colors for the figures. The fade on Sapphire and Syrus' skin was done by laying in a light color then using the clear blender marker right after to fade out the edges.

I've darkened the jackets here by adding a layer of grey-blue, and darkend Sapph and Syrus' skin again, using the same technique as before.

The brown hair on all the figures is done here. I wanted Taylor's hair to have an interesting under-texture to it, so I made sure the red I started with was fully dry before I put another color ontop it. Sara and Syrus got green stripes on their shirts.

By layering different yellows I finished off Sapph's hair, then used a darker blue to do her stripes. The stripes were easy to do with the brush end. Plus some more general darkening of colors all around by adding another layer of color over dry color.

More darkening, plus I let the paper dry this time before I scanned so it wouldn't be warped in the scan.

When you work wet-on-wet (IE, another layer of color before the previous dries) you'll get more subtle, blending effects. When you work wet-on-dry, you'll get more prominent color changes and edges.

Here I've added some definition to the jackets of the characters. Since they are chibi and I'm going to try to keep this somewhat simple; I don't want to go overboard with definition.

A bit of definition in Sara and Taylor's face here. I want to make sure they don't look flat against Sapph and Syrus, who have those nice gradiated colors. Just a bit of light colored yellow and flesh markers to the sides of their faces.

The coaster's seats have been colored a light purple and a light blue sky was added amongst the supports. I want to give the impression of an overcast day, so I stray from the warmer blues of a sunny day.

With light warm grey and cool grey markers I started a base for the coaster. The coaster's coloring will be pretty bright, so I use the greys to tone it doen a bit. I'll let these colors dry before I add any more color.

The supports and track here are colored. Because I used that warm grey on the track the yellow is somewhat faded; not nearly as bright as it would be, which is the effect I wanted, especially in the back, where I want the color to fade out with distance.

More warm grey on the back of the track, as well as some warm yellow on the front to push it forward more. I've also started coloring the rails and cars with a light grey-purple. I used cross-hatching strokes to give texture, and to give myself an idea of how I want to give the cars their definition.

With a dark puple and the grey purple I've done the rails. I first stroked the area with light purple again, then added quick strokes of the dark puple, then used the light purple again to blend the two. This has to be done fast to maximize the amount of blending I can get on a wet-on-wet surface.

Using the same wet-on-wet technique I've done the two cars. There's a good amount of blending because I kept going back and forth with the two markers, but there's also a nice hatched texture as well, where I slowed down a bit so the paper could dry.

A few touch ups, like Sara and Syrus' eyes, and it's done.