Services Section Pictures and header picture in linked service description.

Hi, maybe I am missing something, but I encounter the following issue: I made a new entry in the service section in backend. This works just like a normal post. In this post I define a picture/icon for the post (basically a featured picture), which is shown on the front page for this service. So far so good. However, the picture is also shown as a header in the service post that describes the service further. Given it is an icon it is blown up and doesn't work for this view. I would like to show a different picture in the detailed service description/ service post or don't show a header at all. Disabling the header option on the post view does not resolve the issue. How can I achieve this? Cheers Chris