This is nice, i really like the way he seems to be coming out of the fog, like a sneak attack! There just a few thing thats draw my eyes, his hairline near the bow is too high and the side of his face is too large. I congratulate you on the shading and the hand on the bow, very nicely drawn!
Im glad you liked it! Now that i look at it, the hairline does look to high on the bow's side. I have a ? though. For the face being to big.. which side do you mean? I think its the other side, but i just want to see your opinion!
Um, you said you drew this during class--were you sitting next to the Two Towers poster? I'm honestly not trying to be rude--look: http://elflady.com/legolasgreenleaf/films/lotr/publicity/pages/ea_ttt_01.htm. I noticed that he had no arrow nocked to his bow, despite it being pulled back, and I knew the image was familiar so I went searching.
There's nothing wrong with copying from photos and publicity stills, I just think you should credit when you do. Trying to recreate a picture is a completely different animal than trying to create your own; people give different crits when they know you're working off a reference image.