Imagine Spock with regular old flat eyebrows. Or the Borg without their mechanical enhancements. BORING! Zany hairdos, futuristic outfits, and alien prosthetics play a huge part in making Star Trek both otherworldly and believable at the same time, and women have been at the forefront of this from the very beginning. In fact, the original series' costume and makeup departments were the only production departments (other than DC Fontana in the writers' room) that even employed women. Below are just a few who have made their mark in the costume and makeup departments.
P.S. If you're just stumbling into this series now, feel free to start at the beginning with Trek's women writers. Or be a non-conformist and skip around, checking out producers, music & sound, directors, and art & design in whatever order your anarchist heart desires!
P.P.S. Most of the info below was drawn from imdb.com, memory-alpha.fandom.com, and linked interviews. While I've done my best to be thorough, I admit my fallibility and welcome corrections. The vast majority of women credited with working on Trek have little to no information available about them, and photos are even more scarce. Also, shorts, video games, books, comics, and fan-made media are not included.