WEB-INF is a special folder, and the application server typically (if not always) does not allow content to be served directly from this folder. Your web application can access files under this folder, but you can't simply request /MyApp/WEB-INF/Images/myimage.png in the browser. You'd actually need to create some sort of handler to stream that file.
It's probably far easier to simply move those images outside of the WEB-INF folder, to a location they can be requested directly by the browser.
In preparing for battle I have always found that plans are useless, but planning is indispensable. -- Dwight D. Eisenhower