(Because I lost my old one with the really old, s*** sprites.)
SO! Lets start with my custom TF2 sprites!
Ze Spy iz a double agent!

Yo! That freakin Scouts a Spy!






Now Chell from Portal/Portal 2!





Misc stuff from my Chell expansion
Cores (Cores have been resized for the actual expansion, these are just the original sizes):



Portals:




C&C would be nice! :3

You need to work a bit more on your shading. Everything is really flat. Your anatomy also lacks, especially the Spy with his lanky arm and the Scout's shoulder.

I suggest doing what you have been doing so far, because everything looks much better then when you started. Just keep on spriting and the rest'll come naturally, I'm sure of it. But keep your eyes wide open for any tutorials that you might come acorss, and take a look at official game sprites and fan made sprites every now and then. To compare, and to get ideas.

Will do Damian, do you have any tutorials I can take a look at now?
PS. Which one is the lanky arm? Lol

I must admit that I can't really help you with that. The only tutorials I really considered usefull are for another kind of spriting (texture design). Your best bet would just be to dive deeper into the world of sprites and spriters and keep your eyes open ('just keep on doing what you have been doing' ;3). I'll try to search a few tutorials for you, but I can't promise you anything, sorry.

The one that holds the gun.

That's alright, I'm really thrilled that you want to help me though!
Oh, that arm. I bet you I can fix that ;3

I agree with Damian that it looks flat.
Also, I think that your color palletes need work, as well.

Your animations are smooth as well, though the Spy's shooting looks awkward, because the front pixels of the gun move more than the rest of it.

Just curious, what do both of you mean by the shading and palletes look flat and need work?
I'm so useless I need an example and an explanation >.<

Nice post. I like it. Thanks for sharing these information. Keep it up.

I mean it's definitely a bot, but I'm confused because there are no links anywhere in its profile.

It used smilies so Ionno.