The plastic garbage can just doesn't feel like plastic. The white splotches seem especially out-of-place; scratch a piece of green plastic and you'll find more green... The text seems too sharp given the overall level of wear, and seems to list the same phone number twice while leaving out the city name.
The rust on the VW seems a bit arbitrary - I'd expect it to follow the seams and edges more closely. Also, the lights and trim seem to pristine given the condition of the bus.
I think the bus would look really good if you used a gloss map to differentiate light surface dirt from clean spots. Also, take your viewport captures with a narrower field of view, the wide fov is distorting the volume too much.
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The rust on the VW seems a bit arbitrary - I'd expect it to follow the seams and edges more closely. Also, the lights and trim seem to pristine given the condition of the bus.