Most Helpful Guy
You definitely have skill, but if we're grading this on an artist scale, I'd say basic.
But that's not a bad thing, not at all. Keep at it, I've seen some of the early sketches of even some of the best artists in the graphic novel business, and they weren't half as good as yours at your age.
Stay on the road, and you'll be killing it in no time.
Most Helpful Girl
This is basic, bordering on amateur.
Basic- I'd call that any rigid, grid drawing with limited creativity and unappealing, unprofessional inking/pencilwork, but good proportion.
Proficient - Good proportions, can be rigid, a bit messy, but nice to look at.
Advanced - Perfect drawing, perspective creativity, clean/high quality pen/pencil work.
Master - Advanced plus complexity, advanced coloring and meaning behind the work.