Technique 1:
First of all I made a copy of my background layer.
Then I went to Image>Adjustments>Black&White
Then I inverted the image.
Then I changed the blend mode to Difference.
This was my final result:
Technique 2:
First of all I made a copy of my background layer
Then I went to Image>adjustments>black&white
Then I went to Filter>Stylize>Solarize
Then I inverted my image.
This was my final result.
Technique 3:
First I made a copy of the background layer.
Then I went to Image>adjustments>Black&white
Then I used the Curves to make this upside down V
Then I inverted my image
This was my final result