I have some favourites but if I had to pick one - RiRi (Piofiore, Utakata no uchronia)
Her characters are straight up beautiful, especially Hinagiku from Uchronia
I agree Yomi's art is my absolute favourite, it looks so warm and pretty. Their work for Virche was actually one of my favourites, the only way I could describe it is that her art looks so gentle and soft, it made me cry even more
The artists for Virche and Radiant Tale are very good but my personal favorite is the artist for Bad Apple Wars and Dairoku, they have a very distinct style that I think is hella underrated.
I'm a huge fan of the illustrator 薄葉カゲロー! Her art style is both translucent and gorgeous – her CGs never fail to impress me. For example, the scene of the male lead crying beautifully in 'Variable Barricade' and the CGs in 'reine des fleurs' are absolutely divine – truly god-tier!
My favorite artists include Satol (さとい) of 《Olanpi Asoware》: her figures have a cool and transparent quality; she excels in Western-style painting, but her Japanese style is also very appealing.
Yomi (読) of 《Ken ga Kimi》: her works are in the style of ancient Japan; the lines of the figures are beautiful, the style is delicate, and the expressions, clothing, and accessories of the characters are all meticulously depicted.: