Last time I tried, you can't put an image into a Google form. Example, if you want people to vote on pictures, you can't do this. People use hacks to put in their own image. Am I missing something here? How can Google miss something like this?
Here are the options. There isn't one for inserting and image.
People use hacks to put in their own image
give us an example. You could try to insert HTML tags. But that'd hardly matter if the form data is not used in any html page.