What kind of pencil did you use to draw this piece?

There is aspect's to this drawing i like. For instance, your perspective seems to be pretty accurate, and you seemed to have given the eyes some time to introduce detail.
If i was to critisize, your line look's a little bit messy, or rather it look's more like a design of drawing than anything fluent.

To sum it up however, i think this is a great drawing, at only 14 (i think you are) you have serious potential. Well done.