My advice: do not overcomplicate it or get too ambitious! The image you already have is, quite honestly, fantastic. Do not overthink it. Refine what you have, render it nice, post the result here. Try to finish it within a week or two. Then "put it in your back pocket". Work on another scene, or even two. Or maybe work on a version of this scene with everything you want to put in it, sure. But I really think you have something lovely in the simplicity here.
I'm thrilled to see that despite sharing so few images in the past, all your questions *have* led to some great skills and good work from you. I only worry about your history of very long and largely unfinished projects (due, understandably, both to grand ambitions and the limits of software and hardware). Don't let it come down to the deadline as you try to make it everything you envision, try to make it perfect. From an outside perspective what you have already shown is quite compelling, at least for me...
- Oshyan