Well, whilst I'm, here, I might's well crit your other sprites; I'll do everything on the first post.
Oh, and small is an understatement for that sprite, seriously.
You don't like splashing far from 30x30 pixels, do you? It seems that that's the case. Not only is this sprite small - fortunately not as small as midget-mon up there - but it's monotoned. It's just brown. With, like, two pixels of blue. Again, it's got no memorable features or a real definition of whatever it's based on - I got baby dragon, but even that is inspecific (if that's a word). The pose of this fake is very two-dimensional and generic; it look like it was flatenned in it's sleep or something. I can hardly identify any shading at all, really, which is bad.
This would be more suitable for a basic-stage Pokémon, rather than the one above. The orientation of this sprite is improved from before, at least, and it does have
some, slighlty unique features, like a magnet tail... presuming that
is a magnet tail. Again, the palette is monotoned and, although I am guilty of this, it reuses the palette of it's prevolution, which is pretty unprofessional. The outline for the tail of this Pokémon is really choppy and looks really rigid and out-of-place. It looks pasted on. Furthermore, it seems you attempted to portray the underbelly as a furry spot, but it just appears as a spiky, hard surface. The face is also very... dull, to say the least. At least it's an improvement from it's prevolution.
I'm guessing there are three versions of this sprite, each aiming to get a better orientation, of which it is facing the opponent, however it appears that none of these do that. The first one looks like another one that was ironed in it's sleep, where it was laid in a very uninteresting way. If anything, this looks like a realisticified (again, I doubt that's a word, but I assume you know what I mean) version of a shiny Sandshrew. Sprited badly. From what I see, you've used far too much extensive dithering, in unnecassary places, and it's really not needed much. At all. Dithering is hardly ever needed, anyway, except for when a palette forces too drastic a contrast between shades. Try not to overuse it in future.
It's almost 1 a.m in the morning here, and I looking at my monitor through half-opened eyes, so I'll probably post again later on in the day (almost said tomorrow), when I'm awake. Unless I forget.
Anyway, I hope I've helped a bit; I think I may have been slightly too harsh at times, and I apologize for that; I have nothing against you - all of my crit is from an artistic point of view
, the reliability of that, however, tends to vary.