I would try painting the door and wall at the end of the passage way a colour so that it reduces the length and hang a couple of pendent lights, you could even consider including the left hand wall in the colored wall, ie: end and left hand wall painted

Blank wall is better than mirror. Paint is cheap so I'd be choosing colours.

Love to see the end result!

I would look at framing a 3D wallpaper as another option, something that gives impression of depth!

I love wallpaper down long hallways giving the illusion of depth. Choosing a beautiful scene that's interesting to look at every day you come home.

White paint is the way to go! bright & fresh with a few art pieces on the wall & a nice light fitting.

Would it be possible to knock out some of the wall? It's such a closed in space I empathize with your dilemma.

How about a trompe l'oeil? You can have fun with them.

https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcToSu1Eoz7pilUrlu4tAXzc8rIsB2yfoK43kmYRDjWddJeyEYcD

https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcRINwxd-QE5IIs0CDCGwrp5qUYDzZDdvXQQghCeM9dwYV1J8yqW

I had a long white boring hallway. It used to depress me every time I looked at it. I’m not a fan of hallways but we couldn’t do anything about it, so I decorated it with wallpaper and artwork on one side. It now looks lovely and interesting. ( the artwork on the other side is done by my grandchildren and I’m always changing it )

That looks gorgeous, Fiona!

A mirror opposite the windows will reflect light around the hall.

Wallpaper on one wall ( and even on the ceiling) will create interest as will selective pendant lighting.

Pop in a skylight 2 illuminate the hall.

Being as you cannot knock walls down, I would suggest cutting two or three recesses down the hallway, with tinted or antique style mirrors inside each recess with a soft down light in each....this would create width and reflect light. Perhaps an orchid in each for interest or something small of your taste.
You’d have to check walls first. Good luck

Thus might be too late but turn around your door. At the moment your door opens to the left so you see the blank wall and I presume a dead end. If you turn around your door to open to the right you will see the long hall way which you can decorate as others have suggested above. This will give the illusion of more space.

you need something to walk towards ideally a light source and something to lower the ceiling like a few lights vs one have fun

I would go with a witty mural or infinity mural

Any chance you could open up the windows on the left bringing the outside in. I like the pendabt lights and the lighter floor boards.

knocking down some of that wall would indeed help a bunch. i hope this is something you can do! Goodluck with this!

Thank you all for your generous comments. It’s still a work in progress but I’ll definitely explore the idea of recessed areas down the hall and skylights. I’ll post after it’s done but it may be some time.

Hi Diwarwick,
I suspect you have made a decision but I think Julie Herbert’s second photo shows a very effective solution and at minimal cost. You could re visit down the track if you still wished to but in the meantime it will free up your mind for other things!

Would love to see what you do in the end :)

Also interested to see end result...don't forget!

I would add at least three large paintings to the right hand wall to draw the eye down the hallway.

Ideally you would also paint the back wall and door a darker colour to again draw the eye down the hallway and invite guests into your space.

We did this with our hallway and it made a huge difference!

a suggestion: a tree painting like this, or something similar to this that could give a natural feeling