Regarding the bottom mid panel, Marisa really needs her hat to hide the fact that she's smaller than a good part of the main cast.

The relative sizes of the girls are subjective, though. At best Zun has only given a brief vague description of their heights and only in comparison to each other. Not to mention he also changes his mind all the time.

Explosion said:
The relative sizes of the girls are subjective, though. At best Zun has only given a brief vague description of their heights and only in comparison to each other. Not to mention he also changes his mind all the time.

The relative heights are actually fixed on ZUN's head and somebody should ask for an updated list. Here's what he wrote by PCB's time:

Tall: Sakuya, Meiling, Yukari
Fairly Tall: Reimu, Yuyuko, Alice, Letty, Ran
Fairly Short: Marisa, Youmu, Patchouli, Lunasa, Merlin
Short: Remilia, Lyrica, Chen, Cirno, Rumia, Flandre

I always pictured them being as close brothers.

_cf said:

The relative heights are actually fixed on ZUN's head and somebody should ask for an updated list. Here's what he wrote by PCB's time:

Tall: Sakuya, Meiling, Yukari
Fairly Tall: Reimu, Yuyuko, Alice, Letty, Ran
Fairly Short: Marisa, Youmu, Patchouli, Lunasa, Merlin
Short: Remilia, Lyrica, Chen, Cirno, Rumia, Flandre

I think that was the only point where ZUN mentioned Touhou heights.