Great PDF tutorial from madPotato.de In this tutorial you to will learn how to turn a white canvas into a digital illustration and how you can achieve amazing results without actually being able to paint.
This tutorial will take you through:
Create and colorize a textured background
Create a custom brush-style in Adobe Photoshop
Employ the Smudge-Tool and Displace-Filter
Create and modify custom vector-shapes
Optimize color-curves and alter colors using adjustment layers