Nice Job dude! I love your character designs.
I noticed you asked about head shading… Around here people call it “Zypping” I’ve discovered.
It really depends on who you ask as to how they would tell you to do it.
Here is a little demonstration…
The red circles are on page 2 of the pattern item selection… In the colors tab you wanna drop 1, and 3 down to 0 in the alpha blend.
(I only give my circles a red outline to keep them noticeably different from the rest of the piece.)
Then walla! You got zypping. Peoples styles are always diffrent though. I adapted mine from Scatman originally. AMS taught me some things too. Good Luck and have fun! 
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