Since you said you wanted opinions for improvement, I read from somewhere that the best way to arrange words in speech bubbles is to base the shape of it on the longest word in the sentence. I think you did well on that except for the lower right bubble on the 16th page. You could probably arrange it in a way that doesn't make it look like a paragraph. As for the sentences themselves, it's probably best if you took a break to refresh your mind and reviewed them afterwards to see if it turned out well or if they sound natural to you. Hope you do much better on your next attempt :)