No, signature is a small message under your post... I might have confused you with someone else, but, ahwell.
It's not me, I'm taller, slimmer, and have a full head of hair. The man in the picture is Jon Nödtveit, founder and singer of the worlds first blackened death metal group, Dissection.
They are well worth checking out, now unfortunately disbanded after Nödtveits suicide about 5 years ago...
Also, I highly recommend checking out Pratchett, he satirizes everyday occurances through his own world, the Discworld, carried through space on the back of a giant turtle, flat as a pizza (the world, not the turtle). He makes a parody put of classic litterature, historic events, and much more. He is very appreciated for his work as well, he actually got knighted for his services for british litterature.
Changing avatar is very easy, go to User CP, on your left you have a title saying "Edit Avatar", click on that and follow the instructions.