What is the best method to "complete" canvas?

Hi,

Ok, first I would duplicate the image Layer by pressing Ctrl/Cmd + J.

Next use the Rectangular Marquee Tool to Select the backdrop right of the Models shoe, be sure to add a slight feather to the Marquee Tool before making your selection.

Once you have Made your selection press Copy and past it onto a new Layer by pressing, Ctrl/Cmd + C then Shift +

Cmd/Ctrl +V.

Next flip your selection by going Edit > Transform > Flip Horizontal.

Finally reposition your feathered selection so it lines up with the Layer beneath. You may have to make it slightly lager to fill any gaps.

Then use the stamp too to get rid of the symmetrical look.

I hope this helps!

Sim

If you are using photoshop 2018 and higher, one easy way to get a good result:

1- crop the photo ( inside) to fit the content. Nad press enter

2- in the option bar of the crop tool, check “content-aware”

and now use the crop tool to extend the canvas

it will fill the area from the surroundings, try not to extend the area at once but gradually multiple times.

There are many ways but for this particular image, Content-Aware Fill should work very well. Select the empty area > Shift + Delete