I did this way back when I was working for Judges Guild and I just recently posted it on a FaceBook page for D&D art. I am posting this because the comments I got where some of the best and most flattering I have ever gotten.
"Everything looks more realistic and deadly in the old style art."
"the highlights are where theres just nothing drawn. The absence of a pattern was a really cool means of manipulation for a highlight. It has that musty book smell if i were to ascribe a sense to it"
"Like cs lweis paperbacks that are 30 years old but kept in good condition"