The pig needs a lot of work. First of all, since it's a battle sprite, it needs to be turned as if it were an opponent pokemon facing your own. Second, the shading needs work (source needs redirecting after flip, outlines need to be darkened, general color selection needs to be saturated to a darker level, etc.) Finally, You may want to thicken the tail up a bit, right now it looks like a curved twig that lit off a fart the blew out is butt =b
I'll critique the rest tomorrow, i g2g.
~Des~