Wow this suddenly goes very fast ^^
I wanted to clean up the lineart of amaura but I ended up heavily editing it:
I turned the body toward is more and made it a bit larger. I also scratched the head because it was impossible to turn it with the body (I don't know whether it is an improvement though)
Comments on the new sprites:
Meowstic I like it. Not much to say I think. I didn't check all the details but from the first sight they all look good to me.
Spewpa Wow. I adore it. I don't really like the design of spewpa but you bring the best out of it.
Fennekin It looks very clean. Even though it could have a more Original pose I think it fits fennekin very well
Dragalge I think it is a bit smal and 'as you say' coiled up. And that makes it really hard to see what is going on (even though I think it's partly due to the design of it)
Tyrantrum I looks amazing! The shading and line art look really professional to me

The only thing that bugs me it that it is faced sideways. Sprites are normally used for the games (where they have to face to the other player) while the official art isn't (so they could let it face everywhere).And the problem is this:
Here it looks like tyrantrum will just run past Oshawott.
Also AWildMew, I think you upload/save your files wrong. Because when I look at them they are all smudged (they have like 100 colors or so). Mostly with me it is the same problem if I save them as GIF in stead of PNG. I also could be just my computer but I don't have the same problem with the sprites of SourMonster