Click Load to select a file or capture from the phone camera (only in Android, iOS users get a wooden manikin).
Tap Brush to change settings, and Close to go back.
In draw mode, use two fingers gesturesto scale and translate the canvas.
Tap Align to adjust the image, using two fingers gestures: scale, translate and rotate.
The vertical line specifies where symmetric strokes will be mirrored: try to center the image in that line.
Tap Shave to clean everything.
Tap Export to get an image you can download.
Ok, thanks!