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>>Edit me, please, I need it
If it's critiques and advice you're after, you'd do well to head to the /workshop board, as it's specifically designed for helping shape up art.
The first thing I'd like to ask is how do you form your humans? Do you use any guidelines/skeletons/some form of geometric structure? I ask because going on this picture alone, the construction of the head, the formation of the face, and the way the head connects to the neck connects to the shoulders strikes me as linework drawn without a guide, that is, free drawn.
If that is how you're constructing your figures, I'd advise working with something as simple as a vague skeleton. It's easier to show than explain, so if need be, I can link a good example or two.
Now, two things stood out when I first saw the face. One being that the eyes and eyebrows are uneven, and not from perspective. The other being that as far as resembling the Sniper goes, you have the right idea for what his defining features are, but need to iron it out a little more. Sniper's face is long and thin, with a very tapered jaw, but you do have the nose length and the distance of the mouth from the nose in the right ballpark. Really, you just need some refining, and unfortunately, when digital comes in, that's where I'm not so good at advising.
Keep up, though, you do seem to, as I said, have an eye for what makes a character stand out; and I really do advise heading over to /workshop. There may be people there *far* better at explaining this stuff than I am.