Took a while for my observed opinion to catch up with Darthvaderv's.
Many of us know of the orange-peeling of the ESB dome paint job. As observed on the original TM dome, there appears to be a lacquer coating providing the gloss. It was once argued that the paint was polished to a gloss, but the existance of orange peel texture to the paint suggests otherwise, and the wetness of the on-screen dome suggest the lacquer was applied to gloss up the dome without first polishing the paint to a proper presentation finish. The flaws, were hardly visible on-screen; you had to study production photos to spot the flaws.
Not all flaws require photos though. I was studying the armor surface and was actually surprised to find that the ESB armor was not sanded down to a pristine finish, but that they painted over a casting that inherited all the sculpted irregularities of the original ANH armor, without finishing the surface. Some of the brightness of the light reflecting off the metallic gray portions of the armor hid the defects, and areas of the black paint covered the irregularities. You had to study the wetness and reflectivity of the gloss to notice the flaws.
We've learned that irregularities do not equal flaws. Cleaning something up so that it's ideal does not necessarily recreate a spectacular Vader. We all know how lacking a sanitized Vader can look. Those irregularities play an important part in adding character to the costume, and when you combine the obvious and the subtle of the appearance with the performance of the actor, you get a lethal combination that makes Vader one of the most enduring enemies of all time.