There's tons of information on the interwebs. Look up the youtube channels of Sycra, Kienan Lafferty, imaginefx, idrawgirls, markcrilley. They provide loads of tutorials and how-to-draws. Ctrlpaint.com is good to learn basic techniques. Buy books about anatomy, color relations, proportions, perspective, light and shadow. You can find all the information you need online tho.
If you draw faces, take a look at the proportions. You can generally fit one eye size between the two eyes and the mouth rests in the middle of nose and chin and such things. If you get the proportions right, it starts to look right.
In the end it's all about practice tho. You have to work hard to become good. No magic involved.
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This has to win, the pure tension this picture eludes, is just mind boggling. It's tough, mean, daring, and overall amazing. You deserve to win, 100%, with a picture as well done as this.