Oddly enough, while I really liked this one at first, I came to not care for it as much as some of my later random critter designs--I think the issue may be the horns, perhaps if I revisit this one I'll do something slightly different with the horns. I could try to make them a bit thicker, or add some branches like antlers, or some other shape to them besides the straight "prong horn" style.
She does definitely read as female to me, though, probably due to how thin and delicate the horns are along with the eye shape. Perhaps I could differentiate them from males by giving the males more significant and/or ornate horns...

We could discuss the idea of sex/gender in depth sometime, as it is something I've given a bit of thought to over the years. While a lot of my designs are based on mammals and I don't really put much effort into reinventing the wheel (no matter how much it might stand out that, even in a science fantasy setting, creatures meant to be aliens resemble terrestrial creatures down to the females having a pair of breasts), I have a couple of species in-universe that are either hermaphroditic or transition between male and female as environmental conditions and population demand. For example, the centaur-like Ventrannans (think Brynjarr and Birger), being from a very harsh, icy planet, benefit from being hermaphrodites. Not for any weird fetish reason, but simply because finding a mate when your population might only consist of a few hundred thousand individuals planet-wide might make procreation difficult if you not only had to find a partner, but they had to have the other set of parts necessary to create offspring! While I haven't elaborated much, I have decided that they cycle between the "maternal" and "paternal" role on a sort of biological cycle, which determines which of the pair is "male" or "female" at any given time, but this is only really relevant to bearing young (ie who will be pregnant and who will be out there doing the foraging etc.) and the concept of a gender binary is entirely alien to them--however, when addressed by species that do have gender binaries, they are typically referred to as male.
Biologically, I see a lot of advantages to sexual reproduction, and it seems most efficient to simply have two sexes, although how that translates to things like "gender" and "gender norms" and "gender roles" probably varies wildly between species, and it's something I should explore.

You've given quite a bit of thought to the life of a space-faring character, a lot of good ideas and possibilities there. A shame I just can't be bothered to go into much detail about my various races and worlds all that often, but a lot of what you mentioned does sound like themes I've already explored, especially in regard to the Starfarers (think Domec, Tara, Chandra Reva, Wassa Rydarr, and Queen Rhiannon). Polygamy in particular is a common theme among most Starfarer factions, as they are a species whose evolutionary and adaptation strategy centers around population growth and rapid evolution to adapt to new environments, and each male can impregnate several females while each female can only carry one pregnancy at a time, leading to a roughly 3:1 ratio of females to males.

You've also identified a few major headaches of space commerce and shipping, and I really should just put my thoughts on the subjects out there at some point, too--suffice to say, I highly doubt space travel is actually all that common in my universe, and it's seemingly so prevalent simply because most of the interesting characters in settings with space travel happen to either have access to it or work adjacent to it. Think how many people on Earth, a planet where air travel is a mundane aspect of daily life at this point, have never even been to an airport, much less flown on a plane--and then consider how much more difficult and expensive space travel would be even with space-capable technology being commonplace.

And then there's the logistics of it all, and the politics... suffice to say, there's a lot of room to mess with all the ideas you've suggested at some point, I've only ever mentioned a handful of interstellar factions out of potentially thousands that would exist (be they political, corporate, or simply fleets made up of ships belonging to the same space-faring clan), and the difficulty of maintaining some sort of massive galaxy-spanning empire is the exact sort of limiting factor I love using as an excuse for why even the seemingly massive Lightbearer Dominion seems to only control 20% or so of the galaxy--and most of that is empty space and star systems consisting entirely of uninhabitable planets. And despite their massive military fleet, they somehow managed to lose Space Australia in a revolution where the Space Possums and Space Wallabies were aided by a "federation" of Space Jerboas, their Space Lynx friends and their Space Lizard pals, that only controlled 6 terrestrial worlds between them, and 5 of them are barren desert planets with the sixth being a savanna planet that's not much better, and their "war fleet" consisting of 80% up-gunned freighters and hastily-constructed "nimble fighters" that were basically space-capable aerocars fitted with pulse cannons and missile launchers...

As for WIPs... sadly, I don't think that's ever going to be in the cards. Not only would it reveal just how much of a lazy, talentless hackfraud I truly am and how much I rely on digital art tricks to enable my content generation, my sketches are usually done on scraps of paper covered in eraser smudges and a dozen other incomplete poses and doodles, leaving a mess of borderline illegible scribbles that even I can't make heads or tails of most of the time.

Err... "A magician never reveals their secrets!" Let's go with that. It sounds a bit better.