I like it but why are they eye brows blue? My bad i don't play Undertale so if im being stupid or something like with not knowing the character designs please don't come after me. But i do like your style overall, it doesn't have the body of a twig
i had the idea o make their brows the color of their soul to know which soul belongs to who, for example: Chara and Frisk would be red becaue of Determination, Integrity is dark blue, Bravery's orange, etc.