Having read that artists find the Spider-Man costume difficult to illustrate,i wonder if Spider-Man stories is not one of the characters more difficult to artists and inkers.
Usually Spider-Man stories have plenty of variety of scenarios (cough compared to Batman stories that happen always in the night and have a "easy" costume to illustrate cough) and the Spider-Man costume is difficult enough to artist and inkers.
So one have to wonder if for artist and inkers illustrating Spider-Man stories is way more difficult to illustrate that any other comic book character.