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There are a few ways to make tumblr outlines!
Using the pen tool you can draw over top of your picture and then remove the layer with the drawings on it
2. Screen Capture
Simply take a screen capture on a laptop and click `edit` to get the black pen tool. You can change width and color of your pen in `customize`
There are apps out there such as PicsArt to enable the pen tool or a `sketch` filter which turns your photo into a pencil drawing!
Hope this helps! :)
(picture above is not mine! all rights go to the respectful owner!)