There's not much to see here in Australia in Autumn. We don't get much of a change except for the temp and the lack of flowers and 'pretty things'. It's still as green as ever.
Perhaps if we had a photo contest, it could be of our dogs in our environments? Like, showcasing your home (town not country) with the photo? Is there a local place that is unique or perhaps well known in the area?
That way, you can get all your lovely spring/summer pictures in at the same time.
Just a thought.
Cass.