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and boila, you have a perfect clean face on your drawing !! I use this trick a lot and it's pretty helpful when i have to add a little detail and i don't want to ruin the shape of the head n stuff
then with the free transform tool or the select tool, you click on the line that needs to be removed, hit backspace and then paint the face with the color of your lineart
first you gotta draw your funni head or whatever you want to draw on top without need of a new layer, then with a completely different color draw whatever you wanna draw (like a face for example)