XnSketch is a simple photo program that allows you to add images to your photos and make them look like cartoon or sketch images.
The program includes 18 different effects that change the visual attributes of the photo like contrast and brightness.
XnSketch isn't a photo editor, though. It's more of an effects program to add a different look to your pictures.
If you want to add cartoon or sketch effects to your photos, XnSketch is a good option.