My two favorite characters Thor (Chris Hemsworth) and Loki (Tom Hiddleston) from the "Marvel Cinematic Universe" (Thor, Avengers,...). When I looked at my drawing something like this came into my mind:
Loki: "What do you want me to do?"
Thor: "You distract them with your illusions and then I smash them!"
Loki: "Hitting doesn't solve everything, brother..."
Paper DIN A4, Faber-Castell Polychromos artists' colour pencils, time: I don't know and I don't want to know (maybe 20h+)!
Reference: I was bored, so I combined a few pictures (e.g. Avengers behind the scenes picture and lightning) with Photoshop CS5. For Loki's magic I wanted the "doppelgänger illusion effect" from the movies, so I used a few screencaps as a reference, painted the effect in Photoshop, printed the combined picture and used it as a reference for this colored pencil drawing.
By the way: It's much more easier to draw normal portraits than these tiny faces... I almost flipped out, when I tried to draw Chris face... I think that I erased it 10 times+.Please don't upload my pictures somewhere else without my permission. Don't infringe copyright!
Update: I removed/corrected the grey tint of the scan.
Here some other Thor / Loki drawings: