AbeOfArabia, that's pretty good work here. If you're as good at making ship sprites as you are with portraits, then i'm clearly looking forward your future work.
Kaucukovnik, i think you nailed the disturbing shape for the Baphomet, your previous "bio-potato" was a bit bland by comparison. I have a few things to say about it though.

The first one is yours, the second one have increased contrast (with a little bit of sharpening too) to make it closer to vanilla in my opinion (the "naked" Aurora was the closest thing to your ship i found). Also felt like trying to see what a version with some more greeble could looks like on the third. I feel the "shoulder blades" and bridge needed a little more something. Probably went a bit overboard with the head and legs though.
Another thing, you should try to avoid the pitch black outlines around the sprite though, as it looks weird compared to vanilla. Very dark brown would looks better in this case.
Also, some guy once made a very sweet looking bio-ship. Not quite the same as what you're currently doing, but it might give you some ideas :

Anyway, i hope you'll deliver some more weird stuff like your Baphomet.