I'm not exactly the most experienced artist in anything but the words are slightly above the middle and to me anyway, it doesn't seem quite balanced completely which could be fixed by either putting the words in the center or since the words are also slightly to the left (which isn't contributing to it being unbalanced) you could put something else (or just more of those bubble-looking things) in the bottom right.
It also might just be me that sees it as not quite balanced so if it's balanced to you then I'd say it's very good.