General:
* Sketches: This is a common and informal term.
* Drawings: This is a more general and formal term.
* Illustrations: This implies a purpose of explaining or representing something.
* Artworks: This is a broad term that encompasses any creative work.
Specific:
* Pencil sketches: If the drawings are made with pencils.
* Charcoal drawings: If the drawings are made with charcoal.
* Ink drawings: If the drawings are made with ink.
* Watercolor sketches: If the drawings are made with watercolor.
* Line drawings: If the drawings emphasize lines and contours.
* Freehand drawings: If the drawings are made without tools or guides.
* Quick sketches: If the drawings are made rapidly.
* Rough sketches: If the drawings are preliminary and unfinished.
Figurative:
* Scribbles: This implies casual, informal drawings.
* Doodle: This refers to casual drawings often made while thinking.
* Whimsical drawings: This implies imaginative and playful drawings.
The best word to use will depend on the specific context of your writing.