Ok, so I finally spent a bit of time learning one of the most fundamental car photoshops: wheel swap, lower, tint.
I downloaded GIMP as an alternative to Adobe Photoshop, which is a freeware photo editor that has enough features to do everything I wanted. Did I mention it's free?
Everything I know I learned from this guy and accomplished myself in about 5 hours:
I went from this:
And this:
To this:
I changed the coloring of the wheels using hue/saturation, and tinted the windows using the sand dunes style of airbrush. I also widened the rear tire.