I'm loving these sprites!!
Umm, minor question, doesn't Dorothy have red ruby slippers? Or is it different in the books?
I'd add more vertical rotation to the lions face, like his snout getting higher and almost level with his eyes or somethnig. Right now it's very straight on. I'd also add some detail to the tin man's arms. His legs have black points where his joints are, so maybe his arms could follow suit?
Also, where's Toto? (lol)