CnC: Constructive Criticism
Anywho, you seem to be a bit nooby at art, so here's some advice.
Google images is an invaluable tool for us artists. Wanna make an eye? Look dat shit up online and get a good feel for how eyes look. Need some shading help? Look at pictures of faces and objects to know exactly how lighting affects shadows on varying surfaces.
Experiment experiment...experiment! As Turtle stated, you gotta get out of your comfort zone. Nothing great comes in life without taking risks.
Finally, perfection is boring --- and impossible. Learn from your mistakes and maybe learn your own little shortcuts. This should be a fun experience.
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Draw on!