I love the blowhole, it's a great touch.
@Pulse - supposedly there's a smaller passenger ship called the Dolphin and a larger one called the Beluga. There's an old piece of concept art for the Dolphin.
The top ship here is an older iteration of the Orca and the bottom is the Dolphin.
I feel they're missing a trick by constantly tinkering with the ship designs to get the "perfect" shape - why not release the older versions as the "Mk 1" and so on?
Same goes for SC. I don't doubt that tinkering produces a very refined final design, but the stages along the way usually look good enough for me - extra variety would trump perfection, and having both would be cool.