this is my first head model and in total it has about 1506 tri's. i tried to pay as close attention as i could to the edge flow using a tutorial off youtube the same guy has an excellent hand tutorial as well.
I saw the tutorial.I would say this is a good start but you still have to fine tune it and move some vertices's around. Or else you get that hard edge model look, which component modeling tends to gives you. I like your head better. It looks like you all ready started to fine tune it. The video shows good edge flow but for me the model still needed to be fined tuned. I would keep your quads evenly spaced out. Looks good so far.
His head is definitely lacking width plus the head shape I'm not sure why the top of the head is flattened...should add in an edge loop or two to even it out.
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also, you've scaled the image in for some reason, which makes the final result look odd.