A little over a year ago, I took several photos of an Audi RS 5 while in the Chicago area and I opted to convert it into a monochrome photo to play off contrasting elements and reflection of the sky.

Earlier this week, I decided to revisit and experiment with the photo by making a virtual copy in Lightroom and used both the radial and brush tools to make the RS 5 stand out by eliminating colors of the background elements and kept everything else in color.

I know it's not the greatest example, but something that I have been meaning to toy with for a while. So... thoughts (constructive criticism is welcome)?