Viking and Gladiator.

[Fredde]

.small edit

I got inspierd by Peppermint pig's sprite at pixelopolis/pixelation.

[Peppermint Pig]

They're a bit on the light side. Can't see the details at 1x very well because of it. They're cute, though. Going to do any more?

[Helm]

They're a bit on the light side.

or ARE THEY?

[Pawige]

Au contraire, mon père!

I think the main problem is that they're slightly pillow-shaded and don't have enough contrast. I would try making them a little bit bigger too, teeny tiny ones are much harder.

[Helm]

  : Je suis ton père!
  : NOOOOOOOOOOOOOON!!


and I agree, the smaller they are, the more difficult to make right.

[FaeryShivers]

They're a bit on the light side.

or ARE THEY?

rofl...

I agree with Pep on this those colors may work as flat colors but you need darker shading colors.
The details are there you just need to bring them out.