I've seen some people resubmit deviations that someone else had done for them, whether it'd be a request, an art-trade, or commission. However, that's not my focus; it's something different. I've read that one of the key factors into having a submition be seen is by typing many different keywords. But that's still not by weird comment! This is my comment:

One recent artwork that I saw was this commision: http://www.furaffinity.net/view/7767803/ Which was resubmitted twice by two others (the ones that commisioned the picture). I couldn't help but look at what keywords that they used. Most of their keywords were used by all three of them. And those keywords were:
beach neyru dragonmaster555 surfboard photo dragon bikini swimwear (though  Dragonmaster555 typed one too many "m"s).
These are the keywords that were used by either only one user, or two:
 Nyori &  Neyru used surf and happy.
 Neyru &  Dragonmaster555 used blue and red.
Only  Neyru used western and sun.
And just  Dragonmaster555 used morrogh, fur and scaly.