step 1 of 4
The gate building came from a simple box. It divided by the knife tool. The entry was solid drilled with a door shaped mesh for the contours. Windows and bricks was then beveled or extruded into shape. The gate was stretched and a gate, made from boxes, was modeled to fill the gap.
The towers was then duplicated and a wall was modeled from simple boxes to between the buildings.
All main parts was then jittered to get individual variations.

step 2 of 4
I then added the grass along the wall and the reed along the lake with the FiberFX tool (hair generator).
The bridge was modeled out of a box that I knifed and beveled into a simple shape. The bottom arc was boolean subtracted out of a large cylinder. I then jittered the bridge to make it less geometric.
I then added a single flat planed box for water and adjusted the height.

step 3 of 4
1. The wall was textured with a brick pattern for bump, with multiple procedurals adding the worn out look. At the bottom I added some green vein like coloring to blend better with the grass along the wall.
2. The wall texture was copied, but made a little bit lighter, and less green at the bottom.
3. ...same thing with the towers, but the green vein coloring went higher.
4. ...and same thing with the bridge, but without the green, and a little bit more diffuse.
5. The brick bumping was copied from the previous pattern, but dirt was added to blend better with the border to the landscape texturing.
6. A whole lot of procedurals to start with. It also has gradients to make it more rocky depending on how steep it is. It's also more diffuse the higher it goes (impossible to explain in a simple SBS).
7. The water was quickly made with 3 different bump procedurals. Usually it should have a fresnel effect, but to save time, i made it 0% transparent and adjusted the viewing angle.
8. The road was lightly bricked with bump to make a soft transition to the bridge. It also has some dirt procedurals with fall off to the landscape.
9. Skytracer plugin, with the time set to year 1500 london, 06:00.

step 4 of 4
Medium AA, medium AS, no global illumination due to the dome light.

Final result

