Instant Photo Sketch is a freeware software tool that converts photo to sketch.

This free photo sketching tool works in a very obvious way – all you need to do is open a photo and press one button. There is also one slider to adjust the level of detail – so you can decide if you want small details to be drawn or not.
The output of the photo is a pencil sketch – the picture that looks like it was drawn by pencil.

The program also has zoom and can save the result as .jpeg or .png.