there are4 some nice things going on here , but reflection wise you need to really change your method
like the way the front window and side have refs is really to obvious
also refs should follow bodylines and get distorted by the curve of windows and bodylines
its basicly to hard to explain real simple , to put it short , dont try to use such strong obvious refs on paint it makes it look like colored glass instead of paint
on windows use a tad less opacity and distort the refs more
the the bg is awsome and has got a sort of green yellow tone if you would have used this on the car as a filter it would match so much nicer
here i took 4 ,minutes and gave the car some filtering just to show you what it can do for a car / bg match ... this can be done even better with more time
i just selected the building color (sort of brown tone)

like the way the front window and side have refs is really to obvious
also refs should follow bodylines and get distorted by the curve of windows and bodylines
its basicly to hard to explain real simple , to put it short , dont try to use such strong obvious refs on paint it makes it look like colored glass instead of paint
on windows use a tad less opacity and distort the refs more
the the bg is awsome and has got a sort of green yellow tone if you would have used this on the car as a filter it would match so much nicer
here i took 4 ,minutes and gave the car some filtering just to show you what it can do for a car / bg match ... this can be done even better with more time
i just selected the building color (sort of brown tone)

