It looks good! In your next work take note of the face. In this one the length between the eyebrows and the bottom of the nose is to long. Some good rules to remember are:
If you draw a line to mark the eye brows, then draw a line to mark the bottom of the chin, directly midway between these points is the bottom of the nose. Midway between the chin and the bottom of the nose is the mouth. ;-)
As to other features like the mouth, each end should line up with the middle of the eye above it, just as sides of the nostrils, where the nostril meets the cheek, should line up with the Caruncle ( the Caruncle is the small muscle to the nose side of the eye, in the corner).
You can also find the correct location for the ear by lining up the top of the ear and the eye brow, the bottom of the ear and the bottom of the nose.
Its all a road map to human proportions and holds true for most people, barring some kind of damage or deformity. There are other rules as well concerning proportion that can found in any good anatomical drawing book or probably online as well. But overall I think you did some good work here!