uhmm err Hello Meow Kun! How's the weather today
Nah I can't be slack
First use the the centre, The one that looks like this

. Don't do your own centering because it won't do any good.
Second Ignore and bubble speech space if there any more text to put in (like what you did on the bottom page.) You can adjust its size by pressing ctrl + T, and dont make a new text layer on the same bubble unless it is needed to (for small writings and stuff etc). So you gotta make that "but, but, [Big Space like a massive new paragraph] it looks so delicious"
into
"but, but [Enter] it looks so delicious." Then you can adjust the sizes and all that by pressing ctrl+T And try to make sure that the text dont touch the outside boxes..it shouldn't be like that.
Third use only ONE text type. Different kinds of text type will kill it and will cause AAS as the worst Scanlating team. You should also have a habit to use the Bold when you think its necessary (like when the person's yelling).
Well this probably what I can think of. If you mastered them, try to do re-drawing...which is a major pain. And if you (or someone) dont get what I'm typing, then I have no choice but to type it in like a kindergarden.
EDIT: Ctrl + t is also use of rotation of the text. So try and master the rotating as well.
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[img:]http://i118.photobucket.com/albums/o115/mysteryguy_01/Shakugan-no-Shana-1.jpg[/img:]