As you will see, it is actually quite a simple Adobe Photoshop technique, but the results can be very effective! The workflow shown below is a good way to give an image the added dimension needed to convey shape and form.
Remember this tutorial is designed for intermediate level Photoshop users, so I will not bog down the page with explanations on how to do every little function. If you are not very experienced in Photoshop, I suggest that you go through Melissa’s Colouring Line Art tutorial first.
This is how it looks once all the adjustments are done with the Dodge and Burn tools. You can get that nice chrome, reflective look by alternating different values. An added visual aid is a bit of rim light added to certain areas. I placed it against a darker value to help make it stand out.
And here you have it, an easy tutorial. You can use this technique on any type of character you like, it is quick and looks good, and who can argue with that.