Sketch effect

Some people have been asking me about an effect for transforming photos in sketches.

They told me there are several tutorials in the Internet about that: you combine some traditional filters to get something like a pencil sketch, but the results are poor. This bad quality is not by losing information, but because the result does NOT really look like a sketch made by human hands.

I checked it out around the Internet and could see they have some reason.

This way, I decided it's worthy to prepare a final effect to transform photos in sketches.

More about that in some days.