I'm sorry you found the entry page confusing.  All 3 contest catagories were setup the same.  The "File" box with a 10MB maximum is for animation entries.  If you are entering the 2D/photography catagory, you need to upload an "Image" and a "Thumbnail" only.  I have deleted your entry and you should now be able to submit a new one.  I will suggest to admin that they look into allowing you to edit submissions until they are approved.  Once approved though, you would not be allowed to make any changes for obvious reasons.    

Sincerely,
    Irene Alora
    Renderosity Contest Manager
 

Irene-