Whew! I've been working on coloring Slingshot all morning and afternoon today in-between snacks, phone calls, taxes, my son's requests for new video games and so on.
I thought I'd share the process a bit today. The beginning pages of Slingshot start in a large, busy, modern, city and instead of one page, the scene spans two pages. I've left the image a little larger this time so you can get a feel for it.
I started with the line art:

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I left some white space in the line art (middle and far right) where I will be putting digital billboards.
Today I've been adding all the flat colors:

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The background layer is a gradient to help set the mood and color scheme for the cities colors.
Next I'm working on the shadows and highlights. After that, it will be adding all the special effects such as lighting and the digital billboards. I've been thinking about adding hovering vehicles to the foreground too which I would draw separately so I can move them about. Lots of work done, lots to go!