In specific terms I think it's a sketch. A drawing is a more ruled, formal graphic representation. Sketch implies something quick and freehanded. They can be used interchangeably, however. That is a nice sketch you have.
a sketch is a type of drawing, however it depends on the student.
if that took you more than 15 minutes, and it represents your absolute best effort, i'd probably consider it a drawing if i was your instructor. however, because i assume you could do better just based on what i read from your hand [which seems to imply it was completed in a short time] i'd say its a sketch. in all honesty, a really great presentation drawing should take you at least a day by itself. this is not such an example.
thanks for the comments. i'm just curious of the differences between the usage of the two terms. but i see it as a sketch on my sketch pad. however if this was done in watercolor, oil or gouache with the same quality and competition, one could argue that it is a drawing.