Good Start. The flow seems good, but...

There seems to be a few edges not going anywhere, the one on the temple should be removed and try to use less tris and get everything you can into quads:

The Forehead needs tidied up
The Ear should be quads (as much as you can)
The back of the neck has an edge but I cant see where its going

Bit picky but these things are quite small. and the good news is there doesn't seem to be any n-sided faces :attn:

As arran said, have you given yourself a poly count to aim for?