Why do you use cubes to make the rig, i mean... use alpha glich or make a holes in the skin and fill them with cubes and other stuff.
You are just putting blocks on it's face, that's not how you should rig. But okay...
I suggest... upload images on imgur, then copy image location and paste it here. Like this
Anyways, that's pretty good. I like that you used item sheets instead of cubes since you are a newbie