I rather like the general composition Reinardina. It describes the passage of Time to me, and I personally would not want to crop the image proportions. The lighting lends itself towards the feel gained in viewing old paintings and I think the lead in lines will really work well, if the image is adjusted to provide more appealing verticals on the lefthand side.
From the original I would approach it as follows;
Firstly, reducing digital noise levels locally, so the reduction is graduated to areas, figures, floor, walls (to maintain the textures you desire to keep).
Secondly, increasing vibrancy of the actor figures (perhaps adjusting their White Balance and Brightness as a separate entity, so as to afford any separate tweeking to atmosphere of the corridor).
Thirdly, adjust for vertical and horizontal balance, and finally add finishing touches with Dodge and Burn tools to carry the eye around the image and along the corridor, addressing any distracting elements; Bearing in mind that reducing the light level through the door into the garden may well have the effect of reducing the visual length of the corridor (just as dark colours painted on a wall shortens the room).
Taking a second look so to speak. As the righthand side of the shot sits comfortable to the eye; Dragging the bottom left corner out horizontally until the window jambs look vertical, and then the top left corner up a bit to adjust the doorway lintel, the lady to the left may appear less laid back within the scene (and the little bright spot top left may then be out of shot
Just a further thought upon adjusting perspective more evenly. An alternative option is to rotate the image clockwise to even up the door lintel, and then adjust the vertical distortions left and right to sit comfortably to and within the frame of shot.
Hope this helps rather than confuses
Have fun as I feel sure the end result will be well worth the effort