Everyone has got his own interpretation of what retouching is, but here's mine.

Retouching is about making someone look like a natural beauty. It's not just making someones breasts bigger and blur the skin out.. it's not one hour of work.. it's at least 5 hours (depends on the image though)

Some tips:
- Don't use blur
- Start with a good high quality image, if the start-image isn't good the retouch won't be good either
- Look for tutorials and tips on sites like dArt, ModelMayhem and RetouchPro
- Never stop learning, there's always something to improve
- Do not think that retouching is something you learn in 3 months. It took me 3 years to get on this level, and it's not even a high level yet.

Hope this will help,
Laura.