What can I do to improve this sheet?

[AkumaTh]

It is looking good so far. If I have to criticize, he seems to jitter in the last part. It should be smoother if it is walking. Look at how this is animated for example. Fix that, and I think it would be good.

[RatherNoiceSprites]

I'm not 100% happy with the walking animation so I'll try and make some changes to it later.

Credit to Sonic Team for the explosion sprite.

[miyabi95_]

his arms and legs are very thin and scrawny-looking.

[RatherNoiceSprites]

his arms and legs are very thin and scrawny-looking.

That will be improved in the next version of the sheet.

[RatherNoiceSprites]

I've still got some more poses to make.

If there is anything that needs to be improved please tell me.

[DioShiba]

My first comment is not nessecarily a criticism as much as it is a suggestion but, perhaps maybe make mario shake off the explosion soot rather than have him spin around to get rid of it? I know that might be a little more work but for some reason I feel like it could be a nice touch to the sprite set. But do what you feel

Now for the one critique I do have taking another look on what you have now: I feel like that maybe the animation of mario throwing a fireball could seem a little too jerky. My concern with this is primarily because I feel like that you could accomplish a smoother animation by making the arc of the throw feel a little more planned out instead of having it go so fast with just one frame.

I think the best way to solve this is to add at least two sprites. One in between the pose where mario is ready to throw the fire ball with the pose where mario throws the ball. And the other between the latter sprite I mentioned and the follow through pose. Then what you could also do is rather than have one sprite have a giant blur for the arm is to maybe pixel in two hands and arms to imply the motion that mario is releasing the fireball. (If this part is a little unclear, don't hesitate to ask me to clarify what I mean by this and I'll try to clarify this a little further with the current knowledge I have with animation in general)

All in all however, I still think that you are on the right track with these sprites and I can't wait to see where you go next with these.

[RatherNoiceSprites]

Sorry for the long wait, I've been working on several things at once.

I've made all the poses that I wanted on the sheet and I've added some more colour palettes.

Is there anything that needs to be changed?

EDIT:

I've made some minor changes. Is there anything else that needs to be changed?