Its a leaf... and another leaf... and another leaf, under a plastic bag...
I kid!, I kid!...
From left to right.. my guesses are..
1st leaf, hooky curly variegation thing = genetic thing that can be ignored... Flat, green leaf with no crisp edges = nice feeding
....
2nd leaf, bulgy thing on middle leaflet+petiole green petiole = guessing it was taken from lower on the plant, where it was in the shade. The bulge says the leaf's overfed, but it's only overfed because it was in the shade so didn't process the same amount of nutes as the nice flat one on the left who was getting fed nicely and was in full light so was using the nutes. The green petiole means the leaf was getting enough of everything, while the purple petiole means it's just on the verge of not having enough of something, but is nothing to worry about.
3rd leaf, upside down under bag, not sure, kind of hard to see, but you see how the serrations all droop downwards, that's either because it was in the shade also and was starting to show mild nutrient toxicity, or it was just plucked earlier than the others so has started to wilt more.
This is all complete conjecture formed only on my own personal experience, of which there is not much of.
I'm not some kind of expert growing wizard, I just give my opinion on things and show everyone how bad my sense of humour is.