Whaat's Sprites

[The Lost Global Mod]

i see, that you are kind of developing your own style. That's good, but as luti pointed out you have to work on proportions. Its good know but you will get problems with details later on. So a bit more thicker legs and arms etc are fine. Plus you should improve the size in general, their height resembles little trolls.
Otherwise as already said, put a focus on highlights and shadows. Your contrast is too low on that, but I guess you will see that if you sprite in a "bigger" manner. Now go on and create something good.