I got rid of the source image perspective using transform tool.
step 2 of 18
Duplicated it and flipped it vertically.
step 3 of 18
Made copies of the two last layers and flipped them horizontally.
step 4 of 18
More two copies were made without flipping them now. And using eraser tool with very low flow, I worked on the edges to get an even blending.
step 5 of 18
I merged all the pieces on a new layer and applied sandstone texture.
step 6 of 18
I then selected a row of cobblestone and made copy of it. Using warp tool, I turned it into an arch.
step 7 of 18
Using mask, I worked on the arch edges.
step 8 of 18
I worked on the arch shadows then.
step 9 of 18
I place the window stock on a new layer between the arch and the wall and stretched it.
step 10 of 18
Using mask, I got rid of the wall.
step 11 of 18
Using both clipped layers and adjustment layer, I worked on the window shadows and saturation.
step 12 of 18
I created a folder and put all pieces away. Then I placed the ivy stock on a new layer.
step 13 of 18
Using mask, I worked on the ivy shape.
step 14 of 18
Worked on the ivy shadows then.
step 15 of 18
I placed the same ivy stock on a new layer, moving it to the right side.
step 16 of 18
Worked on its shape and shadows too.
step 17 of 18
I put all the ivy pieces away into a folder and on a new layer I applied some light.
step 18 of 18
On a new layer at the top I merged all the visible layers, made a copy and dessaturated it, applying gaussian bluer to it and overlay blending with 30% opacity.