Note: Some themes use the class of ".ow_header_pic". If that is your case change the "div.ow_header" to "div.ow_header_pic".

In the "if" line after ".indexOf" is the name from the page url.
Here is an example of the user profile link that shows in the address bar in the browser.
http://yoursite.com/oxwall/user/someuser

You can change ("user") to ("dashboard"), ("index"), ("members"), etc. and set an image url for each page. Of course you would need to duplicate the script, and make your changes.

***Paste the script in the body section in admin / settings / page settings.***

1. This example sets a different header image for the profile page.
<script>
$(document).ready(function() {
    if(window.location.href.indexOf("user") > -1) {
        $('div.ow_header').css("background-image", "url(your image url)");
    }
});
</script>

2. This example removes the header from the photo page.
<script>
$(document).ready(function() {
    if(window.location.href.indexOf("photo") > -1) {
        $('div.ow_header').css("display", "none");
    }
});
</script>