Tutorial (see progress pictures below)
Step 1.Rough pencils. I can usually just play around and experiment with this stage, adding ideas and seeing what happens. In this particular rough I originally didn't like the size that I'd drawn Batman so I scanned all the artwork, re-sized and re-positioned it digitally and then printed it off and continued to work from that. I use an A3 lightbox to rough out shapes on a separate piece and then place it underneath and detail it in.
Step 2.Scan and 'ink' the lines. My inking process when working in this way (ie when the final illustration will be entirely made of colour without the lineart present) is to load the scanned image into Flash and draw it all in with the line tool. This way you're guaranteed smooth edges and you can also manipulate the lines quite easily if required.Step 3.Colouring in. Some artists work in black and white and then colourise it afterwards. Although this may be a better way to go about doing it, I prefer to just go in and colour right from the off. So that's what I do, just using the paint bucket tool. I'll usually use another image as reference for the palette. Step 4.All the lines can now be removed by double clicking on them and deleting away, leaving only the colour. Then I export to Photoshop and play around with the colour and textures. On this piece I've used different textures on various materials and just used the 'add grain' function on the night sky in the background. And voila. This took me a weekend of probably around 14 or so hours work.