
How can any of us say good luck we hope you get it done. If you did get it done and you did come here and say look at this that I made! I for one probably wouldn't even bother watching it. That's nothing personal it's just nothing stand-out that would make me say hey that looks amazing let me check it out.
My first number one piece of advice on improving this piece of art is to take it to the graphic arts forum, I am not an artist and I don't think many people here are so we are not really the right people to be giving you advice. Also where did 30% come from? Is that just a number you pulled out of a hat?
For what it's worth though, I'll give you advise based on what limited knowledge I do have.
Always (apparently) draw with a vanishing point. Otherwise the picture will look out of perspective, as yours does. So in photoshop or whatever you are using, set yourself a vanishing point layer and always draw to that point. The direction of all walls/lines/objects should face towards this point. I'll see if I can find you a picture for an example.

Okay the pink dot in the middle of the picture is the vanishing point. You'll notice all the wall directions and the lines of the box point towards the vanishing point. Understanding this will really help your artwork improve.
You might also want to look into light souces, colours and shades of objects change based on the direction of the light that is bouncing off them or whatever.

Also look into texture and things, Water can't be represented by a simple flat block colour and neither can sky. Especially in an animation that would have so much water/sky involved you would need to put a lot more detail into it. Think of the smaller details like the metallic texture of the ship and the texture of skin etc. Even very simple vector animations put time and effort into making things like that looks real (even when they are just cartoons.)
Lastly, People don't have round heads, round eyes, triangular mouths and white skin.
Little things like that. I hope that this post was not so jerk-like that you feel discouraged but rather, more informative in order to help you improve.