It is overgrowth, but I see how that could be confusing. Still I'm glad you enjoy it!
I like the zoomed in version a LOT better than the 1X version. That's always a good thing.
If you want this to be accepted you would need to remove the watermark. The Image spec tool says 201 colors :(
The thing between the two waterfalls in the middle (near the centre of the 2nd tower) is green, not sure if it's supposed to be a waterfall or overgrowth?
Other than that, looks cool!
Very nice, I like the waterfalls and the shape of the image