I liked the original bottom better; it looked reasonably mechanical, while the revised one is only a pair of greyish (why not orange like the rest?) triangular spikes that would look more comfortable on a ram (like in certain ancient ships;
http://en.wikipedia.org/wiki/Trireme) that in the vicinity of a landing strip or an aircraft carrier.
On the whole, the modified design doesn't look significantly more "ship-like" than the first one, except perhaps for making the top left section unlike a gun barrel. The blue pieces, considered in isolation, look quite like a futuristic handgun in both versions alike.
Colours and shadows are mostly improved: the darker blue is crispier, but shading of the top-center orange portion is ruined by the increased fragmentation of parts that were already too small in the first version.
In general, I don't believe in gratuitous details (like the yellow stripes in the top and bottom right fins): your ship would be too complicated at any size, but conveying what 1-pixel parts are is asking too much. The purple outline is another extravagant luxury; being the darkest colour purple should only be used for the darkest shadows, as you cannot afford outlines that are wider than what they outline.
To elaborate on Scribblette's remarks, the most plausible ship type for what I see is:
- Small because it doesn't have empty or repetitive portions (i.e. it is so crowded that it seems be the smallest hull where every system can fit), but not very small (there is an awful lot of stuff).
- Deep space/airless environments only because it is anti-streamlined; the usefulness of the bottom right fin is dubious, as it is neither a wing nor a weapon mount like those in modern attack helicopters.
- Unmanned because there isn't anything remotely similar to a cockpit.
- armed with several forward-facing serious weapons.
