Puppet Warp
With Puppet Warp you place points on a subject and bend it as if it were a puppet. You set anchor points that stay put and drag other points to change shape or pose. Handy for moving an arm, bending a branch or straightening a line.
Select the layer, choose Edit, Puppet Warp and click pins on the spots you want to fix or move. Place pins along a subject, hold down the parts that should stay still and drag the rest to the desired pose. Work on a cut-out subject on its own layer, so the background stays intact. Tip: use it subtly, big distortions stretch texture and quickly look unnatural.
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Prefer a look in one click?
The presets on this site set these adjustments up for you as a starting point, which you then fine-tune to taste.