I cut out the noose, duplicated it twice, and set the blend mode for both of the duplicates at Multiply as a means to darken the noose to have it fit in better with the scene's intense back light. I used stacked black and white rectangles to make the border lines for the picture which gave me pointy corners and made it easy to fine-tune the size and placement of the border lines.

Final poster.

The prison cell photo has some barrel distortion. I used the Lens Correction filter to straighten the vertical bars.

After recoloring the wall texture to match the edge of the photo, I stretched the texture and then skewed it so that the scarring along the bottom roughly angled up toward the vanishing point. To make the wall a bit smoother, I duplicated the layer, blurred it, and set its opacity to 50%. A gradient layer mask made the blur layer negligible on the left, increasing as you move to the right (farther away from the viewer).

The cell door extends outside the image frame so I positioned my poster to do the same for compositional consistency. I determined the vanishing point for the cell door so I could distort my poster to have a matching vanishing point. I gave the poster a tiny shadow.

A slight gradient shadow on the right side of the image adds to the impression that the wall is receding.