Adding a default survey header image or logo
Surveys by default will start with image at the top of the survey unless you have defined a logo for your account under settings.
To set you logo go to the "Settings > General" from top level navigation then scroll down to the "Your Website and Logo" section. There you can upload a logo.
Alternately you can choose an image you may have already uploaded as part of an "Instructions or Information" type question or an email notification using the "View Hosted Images" link or type in the URL for a logo that is hosted elsewhere.
Once chosen the logo will be used by default in any new surveys you create from then on. The settings can be modified for any particular survey under the "Presentation" tab.