Please read the DLC's description shown on this page!! It explicitly states that the DLC is still a work in progress, that only one CG is available in both the free and paid versions, and that the remaining CGs have not yet been implemented.
The images you saw are the only ones available in the DLC as of right now; the rest will be added at a later date (and when I have time to focus on the DLC again) :3
Despite this, I'm happy to hear you liked the demo! Thank you for the kind words ^^