This is a pretty slick technique for taking a photo where the subject was frowning and tweaking it just a bit to add a pleasant smile in its place—which can often save a photo that otherwise would’ve been ignored.
Open the photo that you want to retouch.
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Go under the Filter menu and choose Liquify. When the Liquify dialog appears, choose the Zoom tool (it looks like a magnifying glass) from the Liquify Toolbar (found along the left edge of the dialog). Click it once or twice within the preview window to zoom in closer on your subject’s face. Then, choose the Warp tool ...