Well, nowadays, retouching refers to the 'touch up' techniques used by digital photographers and editors. This walkthrough is just a basic overview of the processes I went through in photoshop.
We're going to start with a simple portrait and go through some techniques to make the whole image look more professional. We'll be smoothing the skin, sharpening the details, changing the eye colours and colourising the image to give a 'retro' feel.
This instruct able does require some photoshop knowledge as i'm not going to explain where to find the various layer styles etc, but a quick google should help you!
Original image as Jpg and canon raw can be downloaded here:
And my photography site (with more tutorials!)
Step 1: Smoothing the Skin
You will then need to apply a layer mask to remove the blur on the areas of the picture where detail is important - the eyes, hair, contours, etc.