Welcome back PA; we never really spoke before but it's great to see you again!
These pictures are really, really amazing. I love the eeriness, the mysteriousness, of the (underground?) city; brilliant. And the loneliness of the second.
The other two are great, too; shame the quality has been lost somewhere along the way. But the world you've created looks amazing, really immersive and imaginative. I'd love to get into it!