Fighting my way to the surface, I go to the computer and scan in the finished image. I use the programs Photoshop, Painter, and Illustrator to render final versions of my pictures. I hate working with just about all standard media. Airbrushes are monstrosities, plain and simple. Pastels get on my nerves.
Colored pencils are laborious and limited.
Everything is difficult to fix after you have made a mistake. I make mistakes constantly. On the computer, when you make a mistake, you press a button. The mistake goes away. I can isolate particular objects and areas, and render them without having any effect whatsoever on the rest of the illustration.