I don't know if you'd call them 'freinds' or not..but after a while, you get your little 'amen corner' who checks out your stuff (as a favorite artist, for example, something encouraged by 'rosity). Nothing wrong with that. I've maybe twice in 2 years published an update; once a castle that someone had some opinions on..followed their advice, and for the next 6 months, the original 'out-hit' the 'improvement' 2 to 1..;) In cataloging all the downloads from here, I do see the occasional dupe (9,000+ pictures, and maybe 100 dupes altogether).
If'n I was to make a suggestion, I'd say if you do a new version of the pic, delete the old one. I've come back to a subject several times (redid a 'mystery ship' at least twice..but remodelled it each time), but usually I delete the oldie first.

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)