Your character design and coloring are good. As a result, I'd make certain frames larger to highlight the art and add more emphasis when the story requires it. A single comic lettering font for most dialogue will make character conversations and emotions easier to follow.
But keep at it! My own webcomic is going through its own trial and error with lettering, colors, etc. Eventually I'll hit the right balance, but that process will take time..
Here is my comic, "Milhamah: Fighting Words." Hope you enjoy it!
https://tapas.io/series/Milhamah-Fighting-Words