Take a picture and load it onto your computer or scan the image into your computer or use a Pixabay image.
Make a copy of the image to experiment with and put the original in a folder for safe keeping.
Open the copy of your image in the free paint.net program:
Select the Effects tab. In the dropdown menu, select Stylize. Then select the Outline option from the Stylize pop out menu:
Adjust the intensity to the desired effect. When ready, click [OK]:
Save as the outline of your image from the File tab at the top of the screen:
Click [OK] to the next box. (Save Configuration box):
Your outline is on your computer ready for you to print it out or whatever.