Ah I always love a good Greek mythology reference, fantastic concept! There are also ample tools for ambience and environmental setting, and while they are expertly written and I love flavor text as much as the next person, I would suggest condensing them to a few keywords and leaving the rest to the wardens.
As Aeon so humorously put it, I would like to see a clear oh fuck moment, as well as a means of resistance. The players will know soon enough that something is afoot, but the true funsies is when they try their best to resist desperately. Aside from the somatic symptoms that clearly indicate malicious influences, I would also like to see hints that prompt the players to point fingers and draw hasty conclusions. For example, if we stick with the gorgon analogy, players might try to use mirrors or other means that help avoid "eye contact". The fun is in these struggles; now the module feels slightly one-sided.