I have often used pictures in my stories, but to be honest, I always use the Quick Cuts to choose what I read, so I never look at another author's pictures, until I have actually decided to start reading, by which time the picture gets scant attention. No doubt, some readers do scroll down the Home page to select their stories, and I think the existing picture is much more likely to attract readers than the second. So what if it's not accurate. No one expects it to be.

I have sometimes found as an author that choosing a picture helps me to visualise the character or scene, so it forms part of the creative process. Clearly, that is not the situation in your case.

To be honest, I wouldn't worry too much about it. You already have a picture that does the job; there seems no point in changing it to something which will not work as well.