Wow - this thread exploded out of nowhere. Guess it's not much of a surprise though.
Anyway, my thoughts on the current groups:
Mammalian: Pretty good selection overall. There could maybe be more furless species (like elephants/rhinos) though? There are also no species that stand out as being adapted to marine habitats (like dolphins/seals/whales) yet. There are also few species that deviate from a 'humanoid' morphology in this group yet (maybe something that's like a cross between a gazelle and a spider, or a tapir, seal and millipede?).
Reptilian: Initially I wasn't particualrly impressed by this group, but I think I've warmed to it. As with the Mammalians it could probably do with more non-humanoid morphologies (I think that may be part of the reason why the turtle-like one is so popular - the hunched posture stops it from looking so human). I'd also suggest perhaps having some with a serpentine morphology (like the Raas or Sakkra from MoO3 - a cobra/gharial cross could be fun) - though perhaps that wouldn't be very obvious from the portraits? In general aim to make the facial structure more lizardy and less human - some of the existing portraits manage this better than others.
Avian: One of the better groups, in my opinion - there's a good range of familiar and alien-looking races in a pleasing variety of colours. At the risk of sounding like a broken record more non-humanoid morphologies are always good but other than that - just keep up what you're doing with this group.
Arthropoid: In terms of morphology this group is great - lots of interesting body plans, suitably alien looking features. My main gripe about them is the colour - why all the browns and greys? Insects can come in a huge variety of vivid, iridescant colours and patterns, so it'd be really nice to see that reflected in some of the portraits. More crustaceans, arachnids or perhaps something trilobite-like might be nice - arthropods are a really diverse bunch.
Molluscoid: As with arthropoids there's loads of diversity in this group, and I think that's pretty well represented in the current portraits, so more of the same please? As always, more non-humanoid morphologies are good!
Fungoid: Probably my favourite group - a nice variety of designs. More like this please!
In general, I'd rather see species that are a fusion of multiple Earth species plus a few extraneous features rather than straight up 'Koala aliens, Cat aliens, Crocodile Aliens etc.' but that's just my preference. If there's some that don't look like any particular species on Earth then that's better still, though that may be difficult with the current clade/'phenotype'-based system. Overall, the portraits are pretty good though - they're better than the designs used in the new MoO and GalCiv for sure, so keep up the good work!
Hopefully you'll consider adding more phenotypes eventually too!
What more can we say?
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