It is impossible for anyone to ascertain whether a banknote is either a fake (or legit) from a set of online pictures (unless a super obvious copy). Confederate & old Chinese banknotes are the most commonly faked notes so there's a tendency to be suspicious from the get-go.
Your notes should be taken to a dealer who is well versed in World & Chinese banknotes to verify. If this is a problem you could always try attending a show & get opinions there. Otherwise, you can send them to PMG & they will simply return the notes if they're fakes (& grade them, if they're legitimate).