Tt's all really pretty.
The older looking faces yet smooth shaded hair are a nice combo. And the tan uniforms clash nicely with the incredibly vibrant and pretty backgrounds, which helps draw focus to the outdoors and will make their bike outfits look flashier by contrast.
That said there aren't any characters I particularly like yet so I'm hoping the rest of the cast is more appealing.
Also, if you like the ED, both voices are actually the same person.
She does cool covers
https://www.youtube.com/watch?v=fN1f_gFlHfs (this is a GUMI song originally)