hmmm....like what the title says, I don't know these ppl, i just ripped their images from a magazine. This is an exercise that i actually enjoyed doing when i took an art class a few years back :) It's easy, you could try it.
Go find a magazine, find pics of ppl that are looking straight at you.... and then rip/cut them out in a square/rectangle. Right after that, cut them in half, where the the nose is at, then pick one side and glue it on a piece of paper. Last go try to replicate the missing half without looking at the un-glue half :) I know...it's tempting to sneak a peek, so b/c of that i tossed my pieces.
it's a sketch, so it took me about 5 mins per each pic...
i'm dedicating this to my panda friend, pandabearluv!!!!!!! hope you enjoy this :)