Customize 404 page based on URL

I have tried a few custom 404 page plugins, but haven’t found one that seems to be able to do what I need.

If the URL ends in a .JPG (i.e. https://mydomain.com/mypage/myphoto.jpg) I want to display a custom 404 page such as “This Photo Does Not Exist” but if the URL is just “https://mydomain.com/mypage/” then have a separate 404 page “This Page Does Not Exist”.

Is there a plugin that can do this? I am currently using 404page, and it simply lets me choose a custom page to display for all 404 errors.