Photoshop's Liquify Filter lets you push, pull, shrink, expand and twirl areas of an image. The Liquify filter is used to distort parts of an image. That makes it a handy tool for correcting or enhancing areas of an image selectively - perfect for retouching.
In this video I cover how to access Photoshop's LIquify Filter, provide a Liquify filter interface tour (that shows how some of the most useful tools within it work) and walk through three demonstrations of ways to work with Liquify for retouching and special effects in portrait, nature/landscape and abstract art applications.
I've listed the start times for each of the video's chapters below:
Chapters:
00:00 What is the Liquify Filter & How to Access It
04:00 Liquify Filter Interface Tour
15:34 Demo - Portrait Retouching with Liquify (adjust clothing)
29:30 Demo - Enhance or Create Forced Perspective (nature example)
42:28 Demo - Create Abstract Art or Shapes (+ Bonus Demo, Text Effects)