You're definitely taking a step in the right direction, it's moving towards a far better outcome.
Anyway, the first issue that needs to be adressed is contrast and saturation. I know you want your colours extremely bright to look like comic book characters, but that doesnt mean they can't be saturated. Contrast. Alot of your colors have a good amount of contrast, but such tones like your skin tones need more contrast. Otherwise you're fine with this issue.
Heres a quick edit adressing a few issues
The pose. The pose you're trying to go for is good and will work right, but the way youve brought it out can be improved. I'm liking what you're going for, i just changed it up a bit.
Anatomical issues. The headshape is more octagonal than anything else, so i changed it a bit into what it should like more.
face issues. a few of these, made a edit as to what they could like.
I'm not awesome at pixel art but i tried my best to give you an example of a step in the right direction. I like the direction you're going in though