These are some simple heads for your 10:1 brick figures. Everyone makes there large brick figures a bit different, so these heads might require a bit of size tweaking. I scale all my 10:1 model to fit the original 10:1 brick figure i printed, a skeleton over on Printables

I added a second print profile where the heads are scaled down, and neck slightly tweaked to fit BigBricks figures

I have not figured out how to easily make the inserts for the faces, so for now you will have to paint them.