Thank you for considering my suggestions. I certainly agree that it is shaping up to be a unique Shivan design. That said, the waist spines give me a mind of the Rakshasa. If I may press my luck however, I would like to voice some additional suggestions... again based on my opinion.
I agree with Betrayal that the 5-point nose shape is a somewhat non-Shivan element. However, I have an alternate proposal to his. You appear to want to have the main gun as a nose button-style turret, as opposed to the spine-mounted types of most other Shivan FS2 designs. I would suggest that instead of your concave nose, you instead chose an "outer" nose. The upper triangular portion of the nose would slope downwards as with ships such as the Lucifer or Cain/Lilith. However, instead of the "3 lights" found on those ships, yours would be recessed within the triangle, in the center of which would be your main cannon. The lower portion of the nose would be swept back underneath and mount another pair of recessed turrets, with either lighter secondary beams, AAA, or missile batteries. If they aren't AAA, then might I suggest miniature versions of Betrayal's head claws mounting AAA.
I like what you've done with the side portions of the head, but the current upper panels seem to me to be completely out of place. Unless this is just the beginning of a more elaborate structure, I am concerned that this section provides too much of a hiding space for players.
I'd like to also suggest that you plan to add a small engine just at the back of the head on the underside. That space seems to be begging for one.
I'd also like to elaborate on my suggestions regarding the repeating tooth I had suggested. As an example, I would suggest a few smaller, aft-swept teeth mounted perhaps down the ship's dorsal spine, then perhaps another pair on the engine segment further to the sides and outward canted, and another pair on the ventral, closer to the center-line and slightly less outward canted. I'd also suggest making the forward dorsal tooth slightly smaller than it is right now. The dorsal and ventral spikes give me an odd impression of a tropical fish which doesn't fit with the Shivan "feel" in my opinion.
Also, if you are planning on making this a shielded vessel, as it says in the original description, you may want to consider adding shield generators... perhaps even subsystems. I'd take inspiration from the generators aboard the Lucifer.
Do you plan on including a fighterbay in the design?