#1 seems to be hard to appricate/evaluate because it's missing an extrapolation of the overall shape. Detail is well and good, if you can't show how it fits with the rest of the ship, it just feels out-of-place.
#2 certainly captures an organic aesthetic but doesn't have the angular/spikey/hard edges counterpoints to those semi-organic lines that is part of other shivan desings, like the Azrael or the Ravana. That would propably be in the future though.
#3 too lacks a bit of angular/spikey/hard edges counterpoints. But what I find most disagreeable about is the mock-up turrets, I just prefer the multiparts on the HTL Lucifer with their triangular design over the round ones from Cain/Lilith - it's a more alien-looking design.
If I had to chose I would like Option 3.
Now, if one were to accept some "in-kind contributions" an incentive that could certainly be arragned
-- no promises though.