I like that you included peter, far too many people draw the young Marauders sans Wormtail. Personally I like the art that includes him, a reminder that he used to be a good person, if only to emphasize the tragedy that was the Mrauders fate.
That's probably the reason I draw him. I like seeing him as the rest of Marauders did, as a good/nice/funny likeable person. Because he must have been something more than just "the one that betrayed friends".