For the current contest, someone suggested pure black and white, with no grey. I decided to give it a try with this picture of a snow-covered swing that I took last week.
Since you asked. The bench seat looks good in your manipulation. The white gives the darker black parts of the bench some definition and form. The pure black support beams seem "out of place"; too stark perhaps compared to the rest of the image? Personally I think you did a good job, a creative and imaginative posting. Best of luck in the contest.
Nicely composed, too. Good good placement within frame. Negative and positive space grab your visual attention. It is a standout for sure.
Best of luck in the contest. :o)