You should upload your screenshots somewhere else - right now, you need to log in to that forum to see any of the images. You might also want to post some examples of your work, so people feel more motivated to do free labor for you in exchange for your guidance. I tried checking what you've posted on here, but all I found were a few health meters and a black blob, which doesn't tell anyone much about how much they could learn from you. You've worked on pixel art "on a professional level" for over seven years. What projects are you referring to? If you're allowed to post examples of your stuff from the games you've worked on, that would probably be best. If not, a list of projects you've worked on professionally would still be good to know for people on the fence about working with you.

Interesting concept, though. I can see someone jumping on this if you post a little more work! =)

that method of putting images into grayscale isnt a very good indicator of the actual contrast of the colors, shown here:

Thanks for posting this. It seems to be a very common mistake.

Wes, I think you should pick up a stick and act out some spear attacks. Your drawings are nice, but the timing and pose here make no sense - who takes three seconds to stab with a spear?! And who stabs with one hand? And lifts their feet? All your power comes from your hips and your legs. Just try throwing a punch like that and see how unnatural and weak it feels.

Anyway...yeah. I'd try a different pose altogether - this one doesn't look very convincing. And a spear jab should be very fast, especially if you're going to use it in a game. Speed blurs won't hide the fact that he's moving slower than most people move underwater. Like conceit says, you should get the basic timing down before trying to add on the bells and whistles. If there's no time to animate his hair blowing around during a spear attack, then so be it. People are going to notice how sluggish his attack looks before they notice how cool his hair looks, hahah!

Edit: Luckily, animation problems are a lot easier to fix than drawing problems:

Just spend five minutes in Graphics Gale deleting frames you don't need, changing the timing on the others, and adding a few speed lines and reaction frames, and presto - Your animation's got a bit more punch now! A stupid animation tip from me: when you're trying to decide on timing for your animation, make sound effects with your mouth. When I imagine a quick spear stab, I think "tsh!" like a cut-off cymbal. Just change your animation until it fits the sound effect you've decided on. It's pretty intuitive that way! Also, act out your animation yourself. Take note of how long the action takes in total, and then decide on what percentage of that total time each sub-action is going to take (winding up, swinging). The ratio of time between keyframes is probably more important than the total time of the animtion, since you can just speed up or slow down your animation in the end.

I guess I take back what I said about the pose, too. Even though it's probably unrealistic, it looks pretty good with better timing. Maybe you could have him twist his feet instead of lifting up the back one, though. I'd try it, but I'm not nearly as good at drawing as you are, sadly.
Actually, I'm really jealous of your drawing skill. Your guy is looking very, very on-model, as Conceit said. My character is constantly changing shapes. I have so much practice to do! X'D

So when you see his sprite you rather think this?:

@coffee:I think of neither, which is a unique problem for this drawing. 
@Cyangmou: Yes, that.
@Pixelalax: Don't get discouraged by a few honest critiques. It's going to take thousands of hours for you to be able to draw a cat realistically. Which is fine, because that's simply how drawing is. Take all the critique you get to heart, and remember that you are *not* your art. As long as you're working to improve, you're doing what you need to do as an artist. Skill and the praise that come along with it will come with (lots) of time and hard work, so don't worry too much about it.

I've been drawing awhile now, and I'm still pretty terrible. If you asked me to draw a cat without reference, I'd be pretty hard pressed to do it.
Did you check out the channel I sent you? You might think I'm a jerk, but my advice to you was honest. That channel covers the basic building blocks of drawing, which will help you improve a LOT faster than drawing cats right now. Cheers. o/