This is a free photo contest with actual prizes. The daily winner receives a coupon for free shipping on orders from mpix.com and the monthly winners receive free software and gift certificates from photo-related retailers.
The only downside is if you’re a daily winner you have to contact them to claim your prize but you can subscribe to daily emails with the winning picture.
you retain the rights to your photos
no limit to the number of entries
can upload or link urls to submit images
watermarks are allowed if small