If you sell your sets in a package, the sell price could be as low as $2 Dollars per set.
I have a package deal for 160 sets of very high quality solo girl sets with very high production value featuring 100 models for $235
This is the package:
https://gfy.com/gfy-content-market/12...ices-50-a.html
Recently, one buyer complained that the price is too high. He wanted rights for an unlimited number of websites for $1 per set. I didn't do the deal but this is where the market is right now.
If you sell them one set at the time, you can get more for them, maybe even $10 as @yoo said.
And, of course, if you can still find a magazine buyer for print rights, you can get good money for your picture sets. But, those print deals are hard to find these days... or maybe impossible.