表情： 情绪的外部表现。分为面部表情、言语表情和身段表情。面部表情是情绪在面部的表现，是情绪表达的主要形式；言语表情是情绪在语言的音调和节奏速度等方面的表现；身段表情是情绪在身体姿态和动作上的表现。 神情： 神色，表情：神情恍惚｜看到她安详的神情，心也就放了下来。 两者区别：神情比表情更抽象，因为表情比较容易表现出来，如：笑、哭等。 神情是靠感觉出来到，比如说话的语调变化，眼神变化，动作的变化等。所以神情是在经过各项观察总结得出来的。 例如：他今天穿了一件黑色旧大衣，双手紧攥着，面目苍白，双唇紧闭，目光紧紧盯着大桥，在那站了一个上午。 　　　你会如何形容这个人的神情？是否是很凝重。这个凝重的神情是综合了所有的观察和内心感觉得出来的。

表情 = outer appearance generally (表 = surface) 神情 = the appearance as a result of the state of the 神. 神 is a Daoist, Chinese medical term referring to the spirit that guides you through your life. In modern New Age literature it is referred to as the 8th chakra.

"神情"比"表情"的感觉更生动一些，“神情”更带有眼神中流露的感觉，更生动。而“表情”指的只是面部的一些变化。个人见解。其实也差不多，语言习惯吧~

Simply speaking, 表情is facial expression,like smile.... it can cover his/her real psychological activity...Sb is smiling doesn't mean he/she's happy. 神情 is something easily exposed in one's eyes, which can be hardly covered unless he/she's a super liar. So if he pretended not having stolen the purse(looks calm), but his 神情 betrayed his nervousness.

表情： you can see it directly from one's face. 神情(神态+表情):神态is kind of one's spirit. for instance: sometimes,you can tell that a person is nervous or sad or lost his mind ,even he has no signaficant 表情on his face ,that's 神情. so 神情 is kind of feeling that you get from a whole person ,not just his face~~~ hope this is helpfull~~~