The left panel in the "Web" source should be re-arranged.
Notes:
1) Change the button label "Check" to "Preview".
2) When a URL is provided and "Preview" is clicked, replace "None selected" with a preview of the image.
3) Have this and the "Upload New" look and feel the same regarding styling and preview display. Use the attached mockup for preview.
4) For "Upload New" (and this one), have the form fields look more like the tabular layout of label/widget on the right. Get the file upload box styled the same as the Title box. (One has a thin gray border.)
5) Beside "Preview", have a ghosted button "Reset". As soon as "Preview" is clicked, de-activate (ghost) the "Preview" button and activate the "Reset" button. Reset can be used both to clear the current display and to unclog a hung request.
Fixed the mockup to have the new buttons.