Adding more and more details.. metals/rust etc
Also put the turret in a nice scene.
The idea is that the camera(person's point of view) will walk past, seeing the turret thinking it's been destroyed, but once you get close the turret will activate, rotate upwards and look towards you. The animation is already done btw.

I just can't really same to make it realistic.. I know I'm missing the specular map, still have to create that one. But any other tips?