Maybe it’s just me, but I don’t see it at all. To me, they look nothing alike. I mean, they are making the same facial expression, yes, but what else looks similar?
Well Korra is the reincarnation of Aang so she's basically Aang's spirit in a different body, but I don't see any similarities which you might be conveying through the picture, but perhaps it's me who's unable to decipher I guess.