Set to a Curve Fit of two pixels for small areas, or three pixels for large areas. A larger number of pixels will increasingly smooth your lines, but try not to go above four pixels or your lines will start curving to such a degree that they don’t retain their original shape.

In preparation for cel art colouring, the picture is filled with the base colours.

The Freeform Pen tool can be found in the Tool palette.

Use the Color Picker to select your colour.

1. Using the Freeform Pen tool, carefully draw an outline around the area where you want to add a shadow. You don’t have to select all the shadow areas for a particular layer in one single pass. It’s best to do one small section at a time so that if you make an error, you’ll be able to undo the single mistake rather than the whole path.