Plugin for uploading photos by public

Hello,

I’m holding a photo contest, which will be based on a wordpress blog (which then likely will have more competitions like that). What is the best way so:
# participants publish the pictures on a page on the blog
# prevent publication of more than one photo per user (for example, an upload form with email/Personal ID/etc.)
# publication via email (for a given email address)
# submit photos into albums, by contest

Regards,
RA