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For the faces, I would suggest adding more personality to them.
I always thought of the ghosts this way:
Blinky- Anger/Bossy
Pinky- Beauty/Brains
Inky- Silly or could be Sad. But I like silly better.
Clyde- Dumb/Brainless



I made an example on what I think their faces could look like. You don't have to make it like my doodle, I'm just showing you what I mean by showing more personality.
This is all up to you though.
And like Vidgameguy said, don't stress the mouth too much.
It's all great stuff, you just need to fix those minor things. Welcome back to the spriting world!