Hello, Newfag here, I make a Cartoon Series on Youtube title

looks pretty bad

stop wasting your time

I believe fully animating it would be a better idea. Not necessarily animating every single movement, but animating mouths, maybe eyes too, and such would be a good idea. Most of your frames aren't much detailed yet the stay on the screen for pretty long, if you're going for a frame that is staying long, i believe you should try putting more detail into it.

Also, your don't seem to have much sound effects in your videos, not fitting ones at least. Try searching for free soundbanks online such as universal-soundbank.