if ur gonna fill the bubble with yellow then u should probably make the shading yellow and not grey

True. And also make the shading a bit orange. Like how the letters in my emoticon were yellow and a dark orangey yellow. (Hue shift)

Third edit~
 

So I thought I wasn't allowed to touch the grey shadings, but I do agree that it looks a bit out of place. I have multiple edits once again x_x
I appreciate all the feedbacks!

Looks a lot better now. Maybe the full yellow emoji could just stay there, like more frames with full yellow. And make the X lines thiccer.

Last edit (probably?)
 

Made the x lines thicker, and I tried to make the frames of the full yellow emoji longer. (This is the maximum size; 31.2 KB)
Feedback appreciated :D

I like this a lot better without the X

fixed some smaller pixel issues, tried a left to right one, which are both different speeds as well. Feedback appreciated!!

for me the last one is the best

this looks much better
i would suggest to end the animation better tho
you should try something like maybe the same animation backwards to end it or simply fading it untill its gone
the way it disappears is too sudden and could just be more smooth going in my opinion

ur overthinking it my man, they all look practically the same

The speeds probably not as noticeable but the direction for sure easily able to tell they are different.

When ur a pixel artist u gain the most intense ocd. As simple as my clout gang emoji looks it took me like 10 tries cause i had to fix a few pixels

This may or may not count as rapid flashing.

quick update, might gif the tongue

I like the eyes and the additions of the tongueeeeeeee lickkky lickyyyy

No it's fine. You know rapid flashing when you see it. His emote had a nice slow transition between colors. Basically dont made anything that could induce seizures/hurt your eyes to look at.