contest rules here
http://www.polycount.com/dota2polycountcontest
1. You do not need to own DotA 2 to enter this contest or create content for DotA 2. All the tools are available in the DotA 2 spectator client. However, your account need to have bought at 1 least item from the Steam Store
2. You will need to create a thread on polycount and update with pictures of your work in Progress
3. Submissions are to be uploaded to the DotA 2 Workshop via game client and tagged with the "Polycount Contest Entry"
4. The deadline for entries is November 19th, 2012 @ 11:59PM EST\
Prizes
Each winner will have their items sold in the DOTA 2 store and will receive royalty payments from their items.
Special Polycount rarity versions of their items – above & beyond the self-made rare items already in the game.
Warning: content must be original and not infringe on copyrights
If you do not know how royalty payments work, then here's how it works
For every player that receives your item in game, you get paid money
usually your items have been received about 3 million times ingame, then you made $30,000.