The Mesh Warp filter can be used to distort specific areas of an image without affecting other areas.
For example, it can be used for dramatic warping effects on a landscape image or for more subtly focused retouching of facial features.
This filter is applied on its own layer as a non-destructive, live filter. It can be accessed via the Layer menu, by selecting from the New Live Filter Layer>Distort>Mesh Warp.
The following settings can be adjusted from the context toolbar: