@Ruslanincha, can we have the original source for this? It'd be an improvement but the neck is much too high from the bottom of the canvas.

As you know, every cut should include a little bit of collar. At the same time, however, the ideal cut only contains 2-3 pixels beneath the chin. Since in some sources, like clearly 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 technique of how this can be accomplished quite easily: