Hey Weyu

I dont think the placement of the poles are that bad to be honest.

the one on the cheek is okay, its not placed in an area that will cause probs if you were to make it animatable (ie:blendshapes) the one I would look at and redirect the edge flow is th one near the mouth, Ive penned over your render, so you can see.

the forhead to from the nose could use a little tweak. Just bring the edges a little higher and terminate them as before. but I wouldnt worry too much with these areas until the whole head is complete at base level with an ear included, then go to town adding and refining the mesh. you'll see more areas to tweak as you go and want to improve later.

Try and keep the polys as near to square as possible too if you can, this will help immmensley in the uv editor.



Overall its a pretty good start

Cheers
Jay