Because, this "hold" will decide animation grooves.... if it is correct, audiences feel it's good animation, if not most of them feel it bad...
Today, i found nice groovy changes and holding, so i tried to analyze this sequences...
here is this
This comes from "How to train your dragons" and i love this nice and cool facial changes and holding.
I wonder how many frames are they use??? let's slice this!
They use 8 frames for changing....and check last 3frames, expression suddenly change! i guess this will make some nice groove.. Yes, 8frames for change. then, they use 18frames to hold his facial expression.
18frames...i notice that it will take long time audiences recognize or catch some thing, in there facial expression....
well, after keeping 18frame hold, he will change his face again in 8frame
and, you know, keep 18frames...how nice groove.
but, each holding poses actually he moves, very little but he moves not completely stop...
"Hold"but not stop completely.
8frame move,18frame hold makes this groove! great. i learn something from this.
in here i made facial expressions whit same frame timing. i did not polish in detail but still this timing looks cool.
remember 8frame move 18frame stay :D.