Hello there, I saw your map really nice one, is good to see that a barrens map doesnt falls back against a Lordaeron or Ashenvale forest themes. I have 2-3 things I recommend you to change (for the contest)
1) Those creeps doesnt loot and they have the same level as the centaur, if they were 2 o 3 units level one I wouldn`t say nothing but since they are 3 units level 2 I think they should loot.
2) I really sugest you to not use those scorpids or change the RGB values so they will look more orange, or bronce.
3) A dragon looting de red drake egg and the rencarnating centaur dropping the Ankh of rencarnation, it has logic but I think the loot should be random, so other items can be in play. But is an opinion we can have a philosophy chat of the loot for hours.
Don´t restrain yourself with the map you created, study ways of improve the enviroment, remember the competition should do the same with their maps.
Other than that, I really like your map, and I rate it with a 5/5 , good luck in the contest