The stats that sell best for each weapon are set in stone. It is not an opinion. You seem to be unexperienced so I recommend you use semlar as a reference for riven pricing since folrens bot has been down for a while.
Sigma unrolled sells for around 60p. yours is past the 10 rolls where kuva cost peaks, and is worth more around 40p~
Azima has 2 good pos stats, where 3 would be preferred, and no neg stat. unrolled would be around 33plat. yours having 2 good stats, no neg would be perhaps 200 if im being generous.
Zenith is also 60 plat unrolled. yours has 2 good positive stats, and a harmful negative, SD effects HM slash procs if they want to use HM/viral, which is one of the most popular builds on crit viable primary weapons. I would not pay any more than 500 for this, and that is again being quite generous, given how easy it is to a roll a 2pos, any neg riven.
That brings the grand total to a whopping 760p, again being generous.