Its very simplistic and lacking in detials for the modeling and texturing, texture sizes ect throw off the scale.

For a portfolio peice I would really tey to go the extra mile with the composition, meodleing, texturing etc etc, it looks a bit rushed, add some wear and tear in there.

Don't hate me for it, its just how I see it, with more time on it for the modeling and texturing and maybe adding nice plant life around it will be a good pice.