not sure what you hand in mind with the colour scheme, sorta looks like a tribal carrot.
youve started to focus on finding individual elements and shapes and stuff in the brush, now you just gotta learn to make them work together.
try using only 1 brush when making a head, keeps the consistancy in the lines and shapes.
the front and back of the head, are like 2 completly different schemes. thin, light and smooth at the back, sharp, heavy and thick in the front.
try joining some lines together, get the flow right, lines should flow with each other.
basically, you did most of what the tutorial said, theres nothing exactly wrong with it, but theres nothing much that makes me say "wow, thats cool"
you know?