Both done on MS Paint. Nine years on, I’m still not so great with perspective drawing!
Art: Human effort to imitate, supplement, alter, or counteract the work of nature.
Drawing: The art of representing objects or forms on a surface chiefly by means of lines.
Doodle: To scribble aimlessly, especially when preoccupied.
Sketch: A hasty or undetailed drawing or painting often made as a preliminary study.
Illustration: Artwork that helps make something clear or attractive.