Spark's Sprites

[SparkMouse]

I'm not aiming for them to be "perfect". This is more a learning experience for me than anything. Once I've finished Yubaba I'll be going back and improving them one at a time, but I can't get critique on something if I haven't made it yet.
I've addressed pretty much everything brought up in this thread so far (and threads on a couple other forums and chats as well), and I (usually) don't know what to improve if I don't have someone critiquing me on what can be improved.

I also don't plan to use these sprites for a game for quite a while, which leaves plenty of time to improve the bases further.