There is yet another way to return a "Picture". I am putting here just to be complete and for future reference. This technique references a "png" image file that resides at our local SharePoint site. Advantages of this method is that it keeps the DevTest image file (vsi) very small which is a nice advantage if we need to return a lot of images. Here is the response. It is returned with the "GET /" command:
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head><title>
</title></head>
<body>
<form name="form1" method="post" action="Default.aspx" id="form1">
<div>
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwULLTE1MTU2MzE5MDhkZPvLjOJEcIy3MmiSgbsJfgZXt/2p" />
</div>
<div>
<img id="Image1" src="http://interestgroups.thehartford.com/group/ServiceVirtualization/Lists/Group%20Documents/ECOS.png" style="border-width:0px;" />
</div>
</form>
</body>
</html>