In general terms speaking, it's quite simple to create a comic like image Canvas with GIMP from a photo or other image.

To begin with, the image was sized in Image > Scale Image... to the standard canvas defined for the #scriptedTales project as:
1920px * 1080px

In:
Filters > Artistic
you'll find the option:
> Cartoon

The respective tool box will open.
In this example the metrics chosen were:
Mask radius: 20
Percent black: 0,8

@[email protected]