Step 1: Paint the shoulder pad with a smooth, even coat. If you have a darker paint scheme you might want to make this area a bit lighter to enhance the effect.
Step 2: Using a fine detail brush, paint diagonal lines the follow the curvature of the pad. I find it easiest to start with a middle line from the corner of the pad and work my way outwards.
Step 3: Using the same method as step 2 paint diagonal lines the intersect the previous ones while trying to keep the spacing even so as to achieve a diamond shape.
Step 4: Highlight the lower v-shapd part of each diamond shape using a lighter colour.
Here's an example of a Black Reach test-model I did to try out this method.
I used Stegadon Scale Green as a basecoat for the model but to make the scales stand out more I used Kabalite Green highlighted with Sybarite Green.
To tie everything together I gave the the entire model a Guilliman Blue glaze but this was only needed because I had made the scales so much lighter than the rest of the model.
I will update this tutorial with new and better pictures once I've gotten some actual Alpha Legion models painted up.
Edited by Freakiq, 17 June 2012 - 04:45 PM.