Do you have the original color image? That might be a better fit for Adobe Stock.
Color content sells. B&W not so much.
Customers can easily make a color image grayscale if their project requires it. But they can’t colorize B&W photos with the same ease. The same goes for fancy filters and special effects. Let customers do that after purchase, if desired.
Read the Photo Dos & Don’ts in your Contributor User Guide.