Mini-Sub Fighter

Based on the Beneath the Waves concept by Zack Stephanchick https://www.artstation.com/artwork/LPYZA
I created this model for a University project, it was modelled in Autodesk 3ds Max, textured using Substance Painter and rendered in 3ds Max using Mental Ray.
Time is always a restriction and I didn't have the time due to other University work to refine this work as much as I would of liked, while I am pleased with the model, I feel the textures need some more work.
Feedback is always welcome :)