i could be my monitor, but i think the colour of the car needs correcting, as it seems to lack contrast to bring out the lines of the car. id recommend going into image-adjust-levels in the composite channel (rgb?) and pulling the highlight slider back a bit to beam up some high tones and then adjusting the shadows bar to hit the low notes and then compensate the midtones for general saturation. unsharp masking is good for creating contrast , experiment widely with the numbers and see how it fares; some values will blow the levels out but youll get a sense for how it can enhance the detail.

ive never seen moonstone grey as a colour but greyscale is tricky in rgb land, so i wonder if the car colour could be worked on as a duotone (black plus moonstone or whatever pantone number it is) and imported as a layer in pshop. i think rgb colour space is bigger than a duotones so it shouldnt shift the colors when imported

i tihk the sky needs warming up a bit, though im not so good on rgb images; i guess adding red or subtracting blue would count the same as adding magenta, but eyball it all the same. i think photyshop got some image-asjuest variations, but you get much better control by using levels channel by channel

contrast is king, cuz thats where the details are; its tricky to get.