Could you tell me pls who is the author? Thx

Looks awesome! You captured great line quality, weight, and accuracy :) This is a smaller detail but a nice tip to be aware of-- artists like to use the direction of hatching to further indicate plane directions and changes. This is one such example of a good use of this technique, where the direction of the hatching follows the form of the skull as it rounds. It helps give it an extra layer of 3D-effect and unity in the drawing, so it's always good to keep it in mind.