I think Jim makes some good points. Some of us are better at black&White than others.
For me, Black&White are very poor sellers. Less than 5% of the images I display are Black&white
but they comprise a much smaller percentage of sales than that.
You might try a test with a few and see how it goes.
I also looked at your site and it is not clear to me if you use any other means of selling your work than the website.
I sell scenic landscapes and find web sales very difficult. People need to see a piece first hand, not on a computer monitor,
before buying it. Almost all of my web sales come from people that have seen my work at the art shows I do, and decide to buy it
later. If you are not doing it now, I would suggest you find a way to put your work someplace where people will see it in person.
For me, art shows have been far more successful than any other method I have tried.
Most other art show photographers I have met, agree that web sales are hardly worth bothering with.