Also, the paint being worn off looks like its really thick paint. and it looks odd, not sure if this is normals or just painted but it looks way to thick to be a painted extinguisher
What part about it do you think isn't realistic and do you mean the painted area or the bare area or both? Do you think its a texture issue or maybe i was too extreme with the render effects? The order is diffuse normal spec then gloss
A few things that stick out as being "off". You are getting some pretty nasty seams both between the join in the side of the extinguisher and also along where the base and the side join. To fix this you can use software such as Mari, Mudbox or Bodypaint to paint a texture seamlessly across the uv islands directly on the…