Some constructive criticism, if you want it to look realistic, you have to be more carefull when selecting the area that you are colour adjusting, there's parts where you have gone over the line and parts where you have missed altogether. The window tint is way to dark to be believable too. Try zooming in as far as you can when selecting the area. Not bad for a first effort though
a bit rough. it takes some effort and time though to make them look like the real deal. stick at it. and youll even trick yourself before you know it!!
Now this is by no means perfect, because it was a 5 minute effort (I don't have the time to give it a proper go), but anyway I thought I would chop it to show u how much difference it make when you take a bit more time to select the edges. Also things like making sure you don't colour badges and the strips on the roof.