Click on the top
layer to make it the active layer and then click on the Create a new layer
at the bottom of your layers palette to add a new layer.
We're now going to use the healing brush to make some adjustments to the faint edge and because we're doing this on a new layer with the healing brush option Use All Layers
selected, the information that is visible in Photoshop's document window will be corrected and placed on
layer. So we're not damaging the original photograph in any way. It also allows us to start all over if we're not happy with the result, by erasing everything on the current layer.
First you have to decide which source area you want to use for the Healing Brush, so move your mouse cursor to a useful area and while holding down the Alt
key (Option key on the Mac) , click once and release the Alt key again.
Continue by improving the edge with single clicks
on the areas that you want to fix. Don't make strokes with the healing brush, because in this example single clicks work much better. Keep an eye on your progress by turning off/on
this layer after every click or few clicks. Press Ctrl + Z
(Command + Z on the Mac) to undo a single mistake.
At some point (close to the shirt) you might have to zoom in. Also make sure that you select a new source area for your healing brush if necessary.
The Final Result
(before image) :
(after image) :