Research & Development;
You seem to be excited about the history of Gladiator arenas. The Arenas should be an open space with multiple props, as mentioned in your paper, but it's not quite as well translated in the Submission. I'd also like to see research into how the structure building was approached at the time a bit more.
Creative Art;
I like the colors of the scene, they make it really pop out. Subtle tones and materials definitions could be pushed a bit further. It's a common standard to do things with tileable textures and dividing things into smaller chunks instead of making things unique. This way, we can get 512 and 1024 texel density content running on game engines.
Technical Art;
The meshes seem pretty well optimized. As previously mentioned, I'd suggest doing some research into tileable textures so you can hit texel densities of 512 and 1024. A basic scene lighting in UE4 can be achieved quite fast with a tutorial such as this one;
Object scales can be tricky to eyeball. I used to have hunches before and they resulted in images looking rather incorrect and funky. A simple solution is to Google for dimensions of objects such as tables, chairs etc.
Judging by the PDF you have basic knowledge of using Zbrush and Substance Painter. That's great! Go ahead and have some more fun with more detailed props to start pushing yourself to the next level. :)
Documentation;
There's definitely evidence of excitement in the documentation, and there are lots of images and WIP shots. The layout is a bit retro to my mind, but the readability hits it home.