Some of the pictures don't show up on my computer (You're Abyssus and Arowana), but the other ones work. Here are my comments:

Kraklaw: I personally think that the colours are improved, but the actual sprite is (as Reliabilty and ImmunityBow have mentioned) weak looking. Also, you can barely see the claws.
Zantilidae: It seems better, but I can't seem to figure out what it is you have improved.
Ferrian: It's better than what we have already, but I think something's wrong with it, I just don't know what (Possibly something about the shield, I'm not too sure).