Charcoal Sketches are very hard to draw, it was also an ancient art
Early humans drawn in caves, on stones, raw walls, pottery.
Charcoal is different than other materials used in your drawings. Your drawing skills should be precise and accurate, other wise it will be messy.
Charcoal pencils consist of compressed charcoal enclosed in a jacket of wood. Designed to be similar to graphite pencils while maintaining most of the properties of charcoal, they are often used for fine and crisp detailed drawings, while keeping the user’s hand from being marked.
Charcoal is a form of dry art medium made of finely ground organic materials that are held together by a gum or wax binder or produced without the use of binders by eliminating the oxygen inside the material during the production process. These charcoals are often used by artists for their versatile properties, such as the rough texture that leaves marks less permanent than other art media. Charcoal can produce lines that are very light or intensely black, while being easily removable, yet vulnerable to leaving stains on paper. The dry medium can be applied to almost any surface from smooth to very coarse. Fixatives are often used with charcoal drawings to solidify the position to prevent erasing or rubbing off of charcoal dusts.