do not underestimate the size of a human head. it is alot bigger then some think. but otherwise i can see you are on right tracks.
and i hope that you will start do more coloring in you art works. and not get to attach for black and white.
Also one last thing, a human face has alot more colors then the one you did in the uper corner.
it works OK if you just going to make an fast illustration.
good luck on future projekt.