sorry for tehe broken links - I duno whats wrong i just copied them from browser -anyway there is that canvas corner weboon whrere they give advice. And since a lot creators using clipstudio paint they also have nice tips. https://www.clipstudio.net/how-to-draw/archives/157055
I gave you links because I am just a regular creator without even fifnished webtoon to give some advices - but I did some research before I started and try to follow it.
First of all - greatwork with color in your page!
But what I can say your page really need more space between panels - the size of white space depends on the action - if it's plain dialogue the space is bigger and if something happen fast the space is smaller, and it really help to build anticipation.
i didn't mean your personal handwrighting - just in general. Mind that there are a lot international readers who are not used to english handwrighing (like me lol). I think it's ok to have some sound effects like OH! and POW! written but handwritten dialogue is driving me crazy. Your example may have bigger font size for mobile - tapas and webtoons allow you to see mobile preview and save draft episodes if you want to check it irl but you can just zoom out in your app or browser