Hi guys, congratulations! you made a great job.
my votes goes to:
Best Composite Work: Onix
Best Animation: Dexter
Best Editing: Onix
Best Visual Effects: Onix
Best Overall Entry: Onix
Onix: Great work, I like it, maybe need more work on the camera animation, nice Vfx, and excellent ending.
Kieran Ogden: I can not see the castle, the main objective is to show the castle with a lot of enviroment Vfx. I see you work on some Vfx, but the castle is on the background, try to use animated cameras like Onix or Dexter.
Marcinek: Nice model, but you must check your camera’s animation curves, try to adjust the curves to avoid the robotic move.
Dester: Nice work, Excellent camera animation, the Vfx are good, In your post you said you have problems with the alpha mask of the castle, to fix that you can render just the objects that you like to be masked using a white flat shader (like maya’s Surface shader), and all the others with a Black one (in maya: black surface shader or the use backgound).
Good job for all. Hope to see you in the nex contest!. 
–<Daniel>–