Artist's commentary
The original translated text does not describe how Reimu fed Marisa the medicine but it is implied to be the tongue to mouth approach mother yukkuris do for their babies.
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I originally planned to insert Mima and Mystia in there but I decided not to. The original plan was to depict a scene of winged yukkuri migrating and I think 3 winged yus at various elevations is enough to depict that.
Making shinki's wings is a pain. Sariel's wings originally had more details but I decided to scrap it. Momiji's tail looks blocky after I compress the size as it originally looks too big for her.
For what I initially thought was a series where I will put in shitty art in a pump and dump type of approach, I actually now care about how it looks.
I still suck at drawing though >=P