Django How do I render an imageField attribute of a model in html?

I'm using the right code for inserting an ImageField in my html page but it still won't render the image, showing a broken link instead. This is the code:

<img src=" {{ model.imageFieldName.url }}>

I'm using 1.8 with debug=truee on my windows machine. I'm new to web development so any explanations would be appreciatied.