Do I have the right idea with images?

I have 12 service areas. Each area gets its own page. Then within that area 20-30 neighbourhoods get their own page. Theres 3 images per page. I add alt text and description. So now I need different images on each page. We now have 900 images needed on the website. Should I be reusing images? Is it okay to have this many images? Am I doing this right?