Went back and added some color to my old Rei'sen drawing with the pens and highlighters I have available.
I would have added skin color too, but I don’t have anything I can use for that at the moment.
I also really like Rei’sen with blue hair instead of the purple-ish one she is depicted with in Walfas, Inaba of the Moon, and KKHTA.
It certainly doesn’t have anything to do with my favorite color being blue or most of my favorite Touhou characters having blue hair (which certainly isn’t just about every single blue-haired Touhou character in existence).
How canon are the Touhou print works? I'm nearing the end of an LP of LOLK, and am debating whether or not to read them.
It varies! Most of the manga are completely canon, like Forbidden Scrollery, Silent Sinner in Blue and Wild and Horned Hermit. Curiosities of Lotus Asia is canon. Perfect Memento in Strict Sense and Symposium of Post-Mysticism are both canon, and are actual texts that exist in-universe (as part of the Gensokyo Chronicle) but written from the perspective of Hieda no Akyuu, so youkai might seem portrayed as more dangerous than they actually are (due to being written by a human). Inaba of the Moon and Inaba of the Earth is just a bunch of funny 4koma, so is probably dubiously canon and not a necessary read.
Other books, for example, the Grimoire of Marisa, are canon, but don’t contain much important information - in this case, it’s just Marisa’s descriptions of various characters’ spellcards.
If you want to know what the most important ones are, I would say:
The first two books of Touhou Bougetsushou (Silent Sinner in Blue, Cage in Lunatic Runagate) These books are about various Touhou characters and their first journey to the Lunar Capital (before LoLK!), and the aftermath of that. SSiB is a manga, whereas CiLR is text-only.
And then also check out
Perfect Memento in Strict Sense and
Symposium of Post-Mysticism for more information on the characters and some interviews! The rest are probably okay to go without unless you’re curious, but they’re also good if you want to, and I would recommend them! The print works add so much to the Touhou lore, and it definitely wouldn’t be as big if it weren’t for them.
The Watatsuki sisters, also known as the Cottonmoons. Seriously, just thinking of their name as “Cottonmoon” makes everything about them seem so much funner. Caroline Cottonmoon and her sister Justine. Er… moving on: