Well, you wouldn't know because both tails are effected by skewness, kurtosis and other monents. To say this another way, a normal Q-Q plot can be used to examine data that is not normally distributed, and in so doing, the skewness is only indirectly shown. One method of determining skewness is to just [calculate it](https://en.wikipedia.org/wiki/Skewness). 

Positive skewness [has been said](https://en.wikipedia.org/wiki/Skewness) to have a longer or fatter right (than left) tail. [Fat](https://en.wikipedia.org/wiki/Fat-tailed_distribution) and [long](https://en.wikipedia.org/wiki/Long_tail) tails are not quite the same things, such that the usual explanation of skewness is somewhat ambiguous. For example, we could have a fat left tail and a long right tail, and that is not uncommon. Thus, the best definition of skewness is from the formula used to calculate it.