These are the photos of the door during the day and the ceiling

Nice door. Putting in a skylight might also require moving the light (to wall sconces perhaps, which could look good) but it would definitely solve the light situation. Depending on your budget, and the climate where you live, there are features which allow automatic closing if it rains, screening to prevent overheating, almost self cleaning etc. I’m assuming of course that you have a single story home, but redirected light tubes also work well.

As an aside, and it might just be my device, with 3 colours of timber, it might be worth looking at staining or painting the beams, which could also lighten the space.

I quite like the door but sounds like it isn’t working out. I wouldn’t install a skylight unless you absolutely have to, your current ceiling is a feature. A door with glass sounds like the answer. What colour was the old door? It will depend n the structure of the new door but it may not be able to have glass installed. You may need to sell your current door and purchase a replacement.

I love your door but understand your concern about lack of light, your ceiling is lovely and I don’t usually advocate painting timber, but you could think of lighting it with a white wash, this will immediately lighten the area, add a fabulous light fitting , it’s a big decision to paint timber.

Just another thought, adding mirrors can add light to a dark area.

Painting the inside of the door white would help.

Because it's a weather board house you could add a matching timber framed highlight window above the door, opening would be good for ventilation but not necessary

A transom window as above, above the door is a good idea. Let’s in light but keeps the security/privacy of a solid door. How much room do you have above the door?

Thank you to everyone for your responses.
I like the idea of staining the beams a lighter colour. Which professional would do this?
I really like the idea of adding a timber framed window that’s a great idea. Do you have pictures you could put me onto?
I have about a metre and a half of room for a window.

This is the amount of space I have

Solar skylights would be a great solution. Just a small solar panel on the roof and a wire to a ceiling panel can add an amazing amount of light without the hassle of a traditional skylight. A transom above the door would also do wonders with the added benefit of seeing the sky, making your hallway feel much more open.

I think you have the overall mix wrong , and IMO that is at least part of the problem . The first thing that jumped out at me was the wall colour -- it is too 80's in my opinion . Go lighter , an off-white but hold the butter haha . Then add a mirror one wall , an artwork with lots of yellows and whites ( preferably in a timber frame that matches the other timber that I'll outline ) .

A couple of other commentators have said about the 3 wood tones , and I genuinely think the darker ceiling and beams isn't helping , plus it clashes ; and while some people think the door and floor are too different in tone , I actually would varnish the door -- the mix of matt and gloss is more a sin than the tone differences , again my opinion . Ideally , slightly darken the door before varnishing if you can . And echoing others -- the light bulb is shocking ! Go modern if it suits , or rustic , just no plastic witches hats or those rice paper balls please !

@Bel I am curious if you have any updates on this. I am having the same issue now and trying to decide what to do.