In regards to the hair colour question, maybe a good idea would be to add the base hair colour to the palettes, so artists can change the shading depending on the lighting and their style, without looking like the characters had just wandered through a hair-dye factory. Also, it'd be lovely if you could have a bit more of a warning for the next song casting - I can't really check the blog too often and missed the first announcement! Anyways, kudos for organizing this and setting up all this!
Err, okay, let me address one thing at a time...
This is a valid idea! I mean, I'm not sure I really want to deal with supplying character color schemes as well, but at the same time everyone knows that the trolls are gray with black hair, while the humans are a little bit more open to interpretation. I'll think on it when I get into making palettes.
I had been making posts about the next set of lyricstuck a couple days before I started it. While it's true I kept things moving along pretty soon after Some Nights was finished (I admit I'm impatient to get these done), I think everyone who's actually following the blog was aware of what was happening.
Rather than checking in occasionally, maybe you should follow the blog or track the tag "greatbiginfo". You'll get all the posts pertaining to artists working on Dog Days right now, which I guess would be kind of weird, but you'll also know exactly what's happening.
I hope we can get you in on one of the next two, good luck!