fruitcandy criticised well.
I will add some stuff to help you better.
you did fine for a first time showing heads,
you made this promising yet raw.
I will use the image for tha sake of learning, no show off purpose.
the eyes of humans are about one eye spaced, try to put eyes close together.
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if you want to get a real reference, try to put a good proportional copy of a human head mapped on sphere.
this image shows jared leto head, look how the eyes are one eye spaced and how the ear is at the end of the front look(You can put more to the side of the side look).
other thing is the nose, you can put eyes measuring forehead and chin, and so define the nose, look on the image( I missed some proportions, but the same space is from the forehead to the eyebrows to the nose and to the chin).
Dont make all heads pale and blank, you can messed with propotions and make strong expressions to get a emotion feel of your head, make to sure to make it fit well on sphere.
keep doing it if you wish, you have talent.
