this is really not bad
i would say the car actually look a tad to dark in comparison to the environment (background)
look at real cars and how lighting works on paint
most people think reflections mean you have to make mirror like reflections from the surroundings
those are real reflections but .....
reflections are less important as lighting , not one car has got one consistant color all over
this is because of the way the light hits the car and because bodypanels and lines bend and the light hits the paint in different angles
even a matt painted car has got difefrent light earea's
these are also kind of reflections
those are the first thing you should try to add
in most cases the car is light at the top and gets darker as you go down
then the ref's you added , you cant just pick one area of the bg and lay it over , you should transform them to the curves of the car , also if a bodypanel is round the ref would not sit straight on that panel (like a flat mirror)
but thats talking about stuff imo you dont need to worry about yet
first look at cars and how they are different light tones all over an d try to understand why (look in real life on the street)
also look how they change as you move around the car
btw this go's for any object on earth without dark and light area's / shade and highlights nothing would look real
thats what creates depth and brings a brush alive
i hope you understand and can use this info
