Wow thanks for all of that! Wasn't expecting quite that much help.
I've been busy with other projects but managed to quickly redraw it this morning. Maybe still not enough contrast? I'll keep tweaking this today.
It needs to be really expressive to communicate the player characters state at a glance so I'll be enlarging the eyes.
(http://i.imgur.com/pfm2fow.png) (http://i.imgur.com/JIsYTov.png)
(http://i.imgur.com/BIa78sn.png)
Another update, I'm much happier with how it looks right now!
(http://i.imgur.com/erNd5Me.png) (http://i.imgur.com/0osk923.png) (http://i.imgur.com/04cjKuK.png)
(http://i.imgur.com/ZbJRJ7w.png) (http://i.imgur.com/Ar7iYaR.png) (http://i.imgur.com/BWCpmOL.png)
(http://i.imgur.com/GKafSHi.png)
Still changes to be made for sure.
Any more feedback still super appreciated!