Classic and muscle car artwork

May I suggest changing the colors of the smoke/flames so they don't blend in with the color of the car? The blue Charger looks great, but the yellow Challenger and orange GTO kind of get lost in the yellow/orange/pink smoke.
I appreciate what you are suggesting. Right now, my focus is on creating the car images and the quickest way I can do that is to use a standard format background. Once I have the digital file, I can change the car color quickly and adjust the background colors too if needed. Here is a series of colors for that GTO image that only took me 20 mins to create since I already had the first image done.

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