How to add images to a qualification test in Amazon Mechanical Turk command line tools?

I am trying to add an external image URL to a Qualification Test using the Amazon Mechanical Turk command line tools. This requires editing the XML file titled "qualification.question" to include the image URL. However, I keep getting errors when I try to insert an image URL into this file.

If I wanted to insert the URL http://ift.tt/1lMhB8S into the code from the "qualification.question" below above the text "What is this a picture of?", how would I do this?

Is there anything else I need to do to get an image into the question?

Thanks in advance.

<Question>
    <QuestionIdentifier>question1</QuestionIdentifier>
    <QuestionContent>
        <Text>What is this a picture of?</Text>
    </QuestionContent>
    <AnswerSpecification>
        <SelectionAnswer>
          <StyleSuggestion>radiobutton</StyleSuggestion>
          <Selections>
            <Selection>
              <SelectionIdentifier>1a</SelectionIdentifier>
              <Text>Earth</Text>
            </Selection>
            <Selection>
              <SelectionIdentifier>1b</SelectionIdentifier>
              <Text>Sun</Text>
            </Selection>
          </Selections>
        </SelectionAnswer>
    </AnswerSpecification>
</Question>