Early Riddle - "No one's ever understood me like you, Tom... " Oooh, scathing mimicry.
Early Riddle II - "If I say it myself, Harry, I've always been able to charm the people I needed."
In the Chamber of Secrets - I was extremely bothered by his shoes.  Don't ask me why.  I wish I knew.  They just bothered me.  I didn't care so much that I was drawing Tom Riddle, but seeing Voldemort's shoes was . . . scary.
Six Heads - Here are a few different attempts at redesigning Tom, after I'd decided he looked too much like Malfoy with black hair, which was also after Tann pointed out that he didn't really have a very 1942 hairstyle.
Later Riddle - This is the new design I settled on after deciding I really needed to redesign Tom.
Thief - Here he's gotten ahold of Harry's wand, the nasty boy.

 

Voldemort I - Here's my first attempt at Voldemort that came out close to what I imagined. Not very close, but close enough that I didn't erase it.
Voldemort II - A slightly scarier, slightly more accurate version ... still lacking in visual clarity, though.

. . .

Much to his chagrin, I'm sure, I find Voldemort more amusing to make fun of than to depict accurately...
The Wrong Trousers - If I had to explain it, it wouldn't be funny.
Peeking - With the Potters' location hidden in a Secret-Keeper, Voldemort could have his nose pressed against their sitting-room window and not see them. (Taking things literally again ... )
Mistaken Identity - Voldemort finds the wrong bespectacled boy – for the whole story, scroll to the bottom of the Snicket Page.