There are already multiple artists working on Snow Daze, Fing is doing outlines and inking, Brellom doing coloring, There is also a third person doing the chibis but I forget their name.
Fing is also doing some of the audio production so that's time that could have been used for more artwork spent editing the sound files.
One of the big complaints was that adding sound to the game was going to cause delays, while I do not think its the reason that it is going on 5 months without an actual story update it sure doesn't look good.
I think most people would be happy with story progression and then updating the chibis, voices, other small things in between, similar to how Summertime Saga tends to do a bigger content update then a smaller update which is "bug fixes", preparing mechanics, small content updates, etc.