Eddy´s Sketchbook

[Samszym]

I think the problem with your expressions is how disconnected the features are form each other. grab some reference for the muscles of the face and maybe look at yourself in a mirror, you'll see that every change of the face causes a change somewhere else in the face.
You can't smile without raising your cheeks and that pushes up your eyes, that's a really important relationship to keep in mind, and also the nose flares out when you get angry and when you make a really sad frown your chin pushes up and when you lower your eyebrows in an angry expression the eyes shrink because they get covered by the orbicularis muscle..a whole lot of stuff, get those relationships down and let's see some believable expressions!