Hmm, I like the initial acid claw look but maybe a little more fine highlighting to make them pop or perhaps a wash to do the same on the edges? I just feel they're not as vibrant as they ought to be or as distinctive, even if you weren't going for an eye-soar explosion.
I agree- the claws need some highlighting to make them pop. Otherwise good though.
This one is a sweet one. You made me want to build a heresy era army...well, I'll first finish the traitor guardsmen hehehe.