Here are some
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Here I duplicated layers, applied filter>blur>gaussian blur, then in blend modes, multiply or overlay.
And I am very fond of this one, in which I left the aperture to very low shutter speed while I "painted" the shape of the heart with a small torch, in a completely dark room.
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And my daughter drew these hearts. Then I photoshopped them, adding color and a shadow:
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Enjoy your Valentine!