looks like a solid piece of work. Things i recommend here are, Adding a lightmap,if this is really for the nextgen spec.You need to unwrap the second uv channel and bake the lightmap with the occlusion in it. Add more definition in the diffuse texture,more dirt,leaking and variations. Model damages to the asset,as it looks…
Just posting because no one else has stated the obvious yet. Put your polys where the players will see them. You have so many polys at the top of those 4 collums that could be spent at the bottom. Given the size of the asset, chances are a player would have to be pretty far off to see that angle, and then the detail is for…