Help with header

Hello,

I am having difficulty with my blog page. On each page of my website I would like a different photo to extend from my header, onto the general page (as pictured). but on my blog I cannot seem to find a template or make this work (attached photo).

Is there a code or something anyone can recommend? I've tried turning a general page into a blog using the same template as my other pages, but that just creates different problems. 

Hi,

Can you share link to a blog post? We can check easier