As Bojan said - the easiest way to do this is selection. Try tu use Quick Selection Tool (W) or even Lasso Tool (L) to select body and face. Then go to Select And Mask Command (CTRL+Alt+R) or Refine Edges in previous version of Photoshop and choose right wiev Use Radius, Feather, Somooth or even Shift Eadges to adjust your selection te way you like it You can use Layer mask (Output section) to hide unwanted areas of your image and as Bojan said add a new background as you wish
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