Ted Naismith is one of my favorite illustrator's of Tolkien's characters and scenes, definitely.
I agree that he probably hasn't had too much experience drawing detailed images of women, because Tinuviel does have a rather chiseled face. I really can't recall much of how my favorite graphic novelists or comic book illustrators draw women compared to men, but your mention, Luthien, of TinTin reminded me that I like Joann Sfar's 'The Rabbi's Cat,' and a few months back I discovered and animated version on Netflix. Sfar actually included TinTin and Snowy in a cameo appearance in the book, and it made it's way into the film version, too. You see both briefly in this preview ~ TinTin's in a pith helmet, and firing a gun in a still shot, and Snowy's talking to the cat.
https://youtu.be/Nw0appwIp3M
But the main thing that pertains to this topic (drawing styles of the sexes) is that in the credits for the film, the background featured Sfar's character sketches of the Rabbi's daughter, Zlabya. Since the story's set in 1930s Algeria, she dresses in a style I describe as 'gypsy,' in brighter colors, with more revealing clothing because of the heat, so the sketches of her were either in said clothing, or partially or mostly nude, and included several face studies. As both a former art student and art model, I admired his inclusion of these figure drawings, because I think that a lot of animators/illustrators feel they can skip that step, citing the existence of computers as the reason. :hmm:
Naismith is very accomplished, but faces are something that require a lot of specific practice, as I integrated into my mind over about 12 years of hearing the life drawing instructors as they taught around me. Maybe these drawings of Luthien are his first foray into portraiture. I too feel that the last one is the most striking, and while his talents mainly lie with 'people in scenic settings,' it's nice to see him do work that pushes him out of his comfort zone.
Eruannlass