I'd've pulled a bit closer and darkened the sky. And would've put the gate on one of the sweet spots. And tried to position the view so the path goes diagonally across it. Buildings, I had to read your description to see they are ruins of buildings. I'd suggest splitting the cubes so parts have windows and parts just the iron grid. Would have added a diffusion map on the windows so they look broken and dirty. The gate and its crag are great, although there could be something in the Diffusion channel, to make the gate a bit more grungy.

-- erlik