If you are just going to use the jpg for the information why not just set it up as an image plugin similar to the fullscreen icon in the top left?
If you want to use the textfield plugin... then I think you just need to set autosize to "none"... with it set to center... it tries to wrap the box around the content... but doesn't pick up the image... just text.... and since there is none... it collapses down.
Graydon