I would also try see if the appearance is better when the bottom side has no outline.

All the advice above are very good in general in order to make the character more lively / real. If you'd rather keep it very surreal however, you may rather choose:
- a sinusoid curve instead of the bounce, like a Ghosts'n'Goblins spectre (https://youtu.be/uIhyjrXVhzg?t=53)
- no squash/stretch matching the movement, conveying is has no mass that would be subject to the law of physics
- a uniform light / not getting light from an outside source
An example of this is the Skel-Monsta from Bubble Bobble, that ignores gravity and walls, and it matches its design : https://bubblebobble.fandom.com/wiki/Skel-Monsta

edit: I had a try

thank you so much, your ghost's animation and colors are quite good

hi, guys,
I drew a ghost monster, but I'm not satisfied with it:
1.the animation seems strange;
2.the color seems not coordinated;

How can I improve my ghost monster pixel art?
thanks!

Hi, I think your animation needs more upward motion. Currently it moves like some sort of gelatin on the bumpy road.

Also try to observe fire as a volume, which increase in size constantly and when it becomes quite big it loose one part which fly off vertically and it becomes smaller again in order to repeat process of growing. By combining this with horizontal movement you've already noticed and applied in your animation you should create something nice.

I've made small edit with same number of frames, it can be made better with future adjustments and maybe even additional frames, but it's enough to show idea I've explained above.



Last thing, which is also quite important, this more resembles wall mounted cup with burning coal (or something like that) to bring light into dark hallways, than actual torch but that's not the point of requested critique.

I hope this was useful for you. Best luck.

oh my god, thank you very much!!!
after you edit it, it looks so much awsome!
yes, I will modify the cup again, that's really a problem which doesn't look like a torch.

Hey!

Cool sprite you got there! If you want it to be more shinier, you should add a bit more contrast to it, so that the shine sticks out more. Basically make the base colour of it darker and then the lighter shine colour will stick out Otherwise if it's a light colour on another light colour it all blends together. And in the same way I think it could use some contrast on the handle too, to better make it all pop, so something like this maybe

hi, thank you very much!!! your new version is very nice, that's the feel what I want