Another hilarious entry there :) Well done General!! Green on!
I fully support your idea and can't wait to see a shark- or dolphin-powered Imperial Flagship
Seriously though - I wouldn't have expected those scallywags to come up with such a brilliant idea! I must say I'm impressed...
What I think this MOC could use as an improvement is a small selection of tiles and other blue/ trans-clear pieces underneath the boat - that way it would look more "out of control" - perhaps if you'd put some tiles & plates under one side only, it would look more realistic (especially given the shark's massive power output
). Of course, you could always try and make the boat look as if it were jumping around behind the shark - but that might end up being a bit misleading in the sense of pirates jumping the shark. Which is also a bit ironic, bearing in mind the distinct possibility that our beloved Pirates line might be turned into a POTC licensed series... But I digress.
Back to that boat again - if you have enough bricks to do that, I'd highly suggest trying to "hide" portions of that boat so that it really looks as if it's in motion. That way you could have the boat sit sideways or semi-upright, which would add tons of realism to this. Those two sloped pieces at the front are a nice attempt at that, but I think that SlyOwl is the MOCcer with most experience regarding such techniques - just take a look at his Tortuga
or Port Royal
MOCs... the first one features a wonderfully offset boat and the second one portrays a desperate sailor in a half-sunk-yet-still-floating crate ;) If only he knew then that sharks could be harnessed!
As to the bird sitting (?) on that pole, I have to agree with badboytje88... The way the parrot is positioned right now really looks a bit too concerning for its own health! I personally would suggest placing it either on the pole which the "captain" is holding (using the minifig hand technique), or slightly loose on top of a barrel (perhaps adding a couple of trans-clear round plates below it) - so that it looks like the poor animal is either going to fall off or get seasick soon ;)
Other than that (with "that
" being mere suggestions rather than actual criticism), I don't really think there's anything wrong with this entry. As far as building style goes, I really enjoy the use of blue grills and flags around the shark and story-wise, it's quite clever and really stands out from the rest ;) Good luck in the competition mate!