While I'm tempted to say that 8 and above is a bit too excessive, I believe that it depends greatly on the art style and the overall proportions of the character(s).
I bring up the Powerpuff Girls in the sense that their proportions, as well as those of other characters in the series, were not accurate, so the big-eyed, large-headed and tiny bodied Super Girls with no digits or feet are still acceptable and likable.
I bring up the Powerpuff Girls in the sense that their proportions, as well as those of other characters in the series, were not accurate, so the big-eyed, large-headed and tiny bodied Super Girls with no digits or feet are still acceptable and likable.