well no Cersei has the same expression on her face all the time, in the first season she had a blank expression and a slight frown, in the second series she had obviously been at the Botox because she was just as expressionless without the unsightly frown. Even if a character has to remain remote and glacial for political or social reasons, you should be able to see the hidden emtions in the eyes. A good actor can say a thousand words with a glance. (Just one example among many because most people have seen it) take for example Frodo's face when they have escaped Moria and have lost Gandalf, he stands alone and turns to camera, silent tears, his expression showing the grief he feels, its intense, or the moment Eomer finds Eowyn, he thinks she is dead, his scream says it all, its powerful, he doesnt need words.Jon Snow is probably the silent brooding type, but I still want to see his inner turmoi, but often his eyes look dead. His mate Sam has all the interesting qualities and humanity. But this is just my opinion, I may be wrong and I dont dispute other peoples reading, its just interesting to know other peoples interpretation.