Here is the reference I'm primarily using for this piece. It's a collection of screenshots from the 1985 Transformers movie, featuring the planet Lithone which is destroyed in the year 2005.


@ Probo: I quite liked the sun, but I understand what you and Harvey are saying, so I removed it.
I will play around with the glass reflection, but I don't really like changing the direction of the lines without understanding why. I really wanted to use this piece to learn more about reflections, so it feels like admitting defeat if I just do stuff because "it feels right". Especially when it comes to something where a correct answer does exist and it's not just a matter of taste.  Your version is probably correct, but I'd like to understand why!
I will say that yours look more easily recognisable as glass reflections, due to the light colours with low saturation, but I rather liked the tinted glass effect I had going, so I'll need to look at a compromise that makes sense.
In regards to the window frame, this is the one thing I am certain I will not include, because I feel it makes the scene a bit cramped and takes away focus from the horizon.

Thank you a lot for your edit, it did indeed give me a lot to think about!

@ HarveyDentMustDie: Thank you, I fixed the top of the dome! In regards to the pillars, I will try to see if there's a good way to add a little bit of orange reflection to them, without losing the current style. Thanks for the suggestion, I was reluctant to try it at first, but it may work. Which heart do you mean, by the way? 

@ Mathias: This is one of those times when someone takes a piece I'm working with and then transform it into something entirely different, but better looking. Your edit has much more atmosphere, it's more interesting to look at, it leads the eyes much better to the focal piece... but the only problem is that it fundamentally conflicts with what I intended this piece to be, namely an experiment with the bright, shiny, naive, dazzling, plastic-fantastic style of the 1980's. Not to mention working with shiny metal in a bright setting.
I will try to do a compromise between our two different versions, and in particular you've shown me that my last version sorely lacked contrast and realistic lighting on a larger scale.

Thanks for taking the time to do that edit!

@milokey: I understand perfectly what you mean.  Thank you. You seem to have a fairly technical understanding of these reflections, but I'm still hoping that someone will explain to me the angles involved. I have a lot of gradients and bands of light to represent reflections of various light sources, but all the angles I have chosen are almost completely random. I don't understand what I'm doing here, so I'm hoping someone is able to give me a more technical explanation. See my third post in this thread. If you can help, I would be very grateful indeed.

My latest WIP. I have not finished incorporating all the ideas and advice you guys have given me, so this will change rapidly.