These guys contacted me about their (not free) photo contest -
The quality of the past competitions seems high.
If you are interested the contest is URBAN 2016 Photo Awards Contest - VII edition - promoted by dotART
(I am not related to or compensated by this competition in any way)

As always read the rules and make sure you are comfortable with them. The rules on copyright seem poorly translated and very broad imo, but not everyone takes these things as seriously as i do.

Good luck if you do enter!