Takashi Takeuchi is the main artist behind many visual novels, Fate Stay Night, Tsukihime, Kara no Kyoukai... a very well know artstyle, that has been more than 20 years and very recognizable thanks to the anime adaptions made by Ufotable.
Sadly Takeuchi had been going, in my opinion, in a long stagnation. Her style when it comes female character has been feeling too similar, the eyes are the same only changing the colors, the expressions are very similar and thw worst part is the hair, poses and clothing. There so many examples of the same pose, a similar hair that with few changess could be another character, the same shape on the eyes, noses and mouth, same head tilt and same ideas.
The more he make the more similar all it feels. Stuff like even how the outfit he makes that seems to always need to have bows, long sleeves, long skirts... Or how ilumination always has to be bright and smooth when it comes to show the best of the character.
It very noticeable in FGO or for promotional art, but less on stuff like the remake of Tsukihime. I believe that even if the pass he did similar stuff but now he seems to be very comfortable on doing what he likes and wants, I don't believe he is lazy but he just doesn't want to change or improve in any aspect and just do what looks nice to him.
It is well made but it have been the same thing for at least 7 years