It depends on how it is implemented on your website. If it's just a plain page with a title and description, and just the image slammed into the page with no content, then it won't do any good for page or image SEO. Instead, it can even harm your indexability as the pages might consume some of the "crawl budget". You can read more about it in my answer here.
My suggestion would be to link to the images directly. If you want to however keep the image pages, you can set them not to be indexed through the meta no-index tag in the header. Regarding image SEO I would suggest you work more on optimizing the image file name, title and description on the page where you are using it, and keep creating quality links for your website and pages.
I hope my answer was helpful to you. If I had a link to the website I would be able to give you a more accurate response/solution.
Daniel Rika - Dalerio Consulting
https://dalerioconsulting.com
info@dalerioconsulting.com