These are highly sought after attributes - which would bring many NFT artists and industry to the Enjin platform if achieved:
  1. A % of royalties returned to the creator for every secondary sale (this potential for ongoing passive income for an artist is revolutionary)
Taking it a step further... can u embed into the contract that this % of sale royalty transfer occurs even if the asset is taken off the Enjin platform and sold somewhere else?
  1. Embed subsequent sales data on chain
I would strongly suggest bring together a working group of highly regarded OG NFT artists to inform and give insights to the build and thus have a sense of ownership so they will also champion it when released.
Ie use the same customer centric approach you have used to build the platform’s gaming related functionality.