@Mall Musicc, please keep in mind that all cuts should include a little bit of collar. At the same time, the ideal cut only contains 2-3 pixels beneath the chin. Since in some sources (like probably this one), the person in the image may have a longer neck than usual, this would be quite difficult to achieve naturally. 

Here's a video displaying a simple technique of how to cut close to the chin and still display a bit of the collar:

I'll fix this one myself, but please make sure all your cuts include collars in the future.