Well seeing that you have your site password protected so no one can even see your site
Most likely problem is you have not uploaded the images to your file manager area
You need to make sure you have everything coded correctly on your web pages especially images or anything else
Also make sure you have the images optimized/sized down to an appropriate size as you seem to have the free subdomain with free hosting so you could end up using up your 5mb of space quickly as well too if you have oversized images on your page
Most likely reason is simply forgetting to upload the image files. They have to be explicitly uploaded, its a common mistake to imagine that uploading the html files somehow picks up associated graphics and stylesheets at the same time.
