The first one only needs to remove the word "developed" because Korra did start out pretty strong (Katara: "She's strong" *korra defeats firebenders with ease*, not to mention how much ass she kicked when she first arrived to the city, that's what defines her, she's strong but naive and inexperienced, but strong she was oh yes she 'was'.) By the end of this book Korra is both chickified and pussified from the first korra we saw, which was a korra i liked because she didn't infuriate me as much as the korra from near the end of the season.
BUT YEAH THEY DON'T REALLY ELABORATE IN SUCH A TINY LITTLE PIC BECAUSE Y'KNOW
Bolin never popular with girls huh, you already forgot the whole "Mako: Shit Bolin, you brought ANOTHER
crazy fangirl here again?", *bolin enters the stage, cue millions of fangirls going BOLIIIIN LET ME SUCK YO DICK*. Bolin starts out super famous between the girls that attend the arena, which are quite enough girls for anyone to assume Bolin is popular with girls. Just cuz he's not the chick magnet of the "main girls" doesn't mean he is not popular, but by the end of the season Bolin rarely speaks, and he does so only to say something silly/"funny" or to get brushed off coldly by the pussified Korra. He essentially becaomes not only a clown, but THE clown, because him being an earthbender makes him even less popular (with the avatar fandom) because there is already a much better and interesting earthbender called Lin that kicks so much ass her feet permanently smell of farts.
So yeah, i'd say the picture is pretty spot on imo, if anything it just need "developed" to be removed for nitpickyness sake, but tbqh the image is self-explanatory.