Yang's Sprites(Need Critiques)

Hello, im posting here my most recent sprites, and i want some construtive critiques on some of these.

Isaac(Golden Sun):

He's a playable character on my smash bros fangame, so he's going to get moves.

Axel(Disgaea 2):

Assist Character.

Some portraits:
Dark Pit:

Ike:

Kirby:

Mario:

Master Core:

Pikachu:

Slime(Dragon Quest):

Sonic:

Villager(Yeah, i know i missed a "L" )

Yoshi:

Young Link:



Some Itens:
Mushroom:

Poison Mushroom:

PokeBall:



And that's all Folks!
(Positive C+C is greatly appreciated)
[/img]