I wasnt alive when you did this but those are incredible!
There is something to be said about all these little tricks. I think your comment about scans highlights this, meaning you do loose character when the artist isn't in total control.
I suppose one could, at the time, have a more personal technical style. Not sure how to word this and not even on a good level on the topic to draw proper conclusions. I do draw (mostly concept art, I'm good with humanoids though!), but its not what I do for a living, just to help the team understanding ideas for levels and such. I'm a programmer first and foremost.