Hey , haven't been on here for quite some time. but here are some sprites I want opinions on.

One Is an evil balloon and the other is a base for the three main protags

I wouldn't have  seen the shading on the lighter bears had you not mentioned it in text. At 1x, it's barely visible because it's so similar in value (darkness/lightness) to the base colours, so it's not doing its job. Make it darkeron the brown and white bears, and maybe also on the white parts of the panda.
I would recommend making the shadows warmer rather than cooler, fur tends to be warm. This is especially noticeable on pandas and polar bears: http://awtlblog.vitsco.com/wp-content/uploads/2013/05/Polar-Bear-Cafe.jpg

I can't see the eyes on the black bears at this scale. Maybe they could be a different color?

that's a good detail to keep in mind. i was wondering.

The shadows on the white fur, and the eyes on dark fur, are still not very readable, but the hues are looking good!

For the eyes, maybe you could give them 1px white-ish highlights? That way they can stand out. It might also make them look like creepy glowing white eyes, but you won't know until you try it.

x4
I added a back view of all the bears and added all views for the balloon.

I'd increase contrast in general. As said by others, the eyes still get lost in the darker versions. Also x4 is a bit large, surely x2 or x3 would suffice.

I was making an edit, but got lost in making it look like a bear :/ My bad.

x3
I started a walking animation. But before I move on to animation is the contrast ok?

x3
frame by frame
The Bird is supposed to change into the balloons hat then the balloon appears from the hat.

That's a cool animation, very creative!
The bears are a lot better, but now I'd say the bird itself in the animation lacks contrast.

Contrast seems to be an on going issue in your work. It might be worth doing a quick study of Values, which might give you a better understanding of where you're going wrong.

The colours do contrast here, thats good. Lighting on the other hand is a bit odd, but if its just for a test, I'd suggest moving on.

Humans!!! the new protags!
the protags are the ones in tank tops. tear them apart! But, be gentle they are my babies. oh one more thing if you think the girls are familiar. They are also from a game of mine that went under. Yah I tend not to finish stuff.

the arms should move less i think

(Oh before you look if any of my characters are sexualised then the opposing sex will be sexualised as well fair warning.)x2
This is my sheet where I make then make them pretty.
but there are a lot of changes to the sprites but I'm not going to list them because there is to many to list
but go at it.

Is everything ok before I move on?(i haven't heard anything in some time) Next is animation and applying side views. I don't want to start animating and having to change colors and hues if there not correct.

hey, I haven't been here in a long time. but I took a break from pixeling but now I'm back. I did some color revamps on the humans and I want yall's thoughts on the new colors
X2
edit : ( the color pallet is 10 for each tell me what you tink or should I up the color limit?)

The humans look good, they have the same style. Is the bald guy missing an eye?

I would also suggest a different bathing suit color for the girl in orange hair, the lightest one doesn't read strongly enough as clothing when I look at it.