1) Chloe Bourgeous.
She is kind of a b. She was one of the main antagonists earlier. She is a bossy spoiled bully and a daughter of mayor of Paris.
Her expression: angry at Sabrina because her yes-girl left her for another mistress
Model of Chloe:
https://www.pinterest.ru/search/pins/?q=Chloe%20bourgeous
Chloe's expression in cartoon:
https://www.pinterest.ru/pin/729301733393739521/
https://www.pinterest.ru/pin/729301733393739533/
Angry expression:
https://www.pinterest.ru/pin/729301733393739360/

2) Sabrina Raincomprix.
She is Chloe's "best friend". Actually she is more like a slave. Chloe bullies her and bosses her around but Sabrina for some unknown reason stays with her and does whatever Chloe says. Once Sabrina snapped and briefly left Chloe with argument. According to creator she is going to do it again, now seriously. In this comic she falls under influence of Lila - even worse girl than Chloe. In this scene Lila is Sabrina's new "best friend".
Her expression: angry at Chloe of all the crap she did to her also determined to stay with Lila and left Chloe for good.
Her expression should be something like this:
https://www.pinterest.ru/pin/729301733393639347/
Model of Sabrina:
https://www.pinterest.ru/Valemidin/sabrina-raincomprix/
Expression in cartoon:
https://www.pinterest.ru/pin/729301733393740212

3) Marinette Dupain-Cheng
She is protagonist of the series and a good girl. She doesn't like Chloe but Lila is much dangerous person who could ruin her life. Marinette doesn't want Sabrina to fall under Lila's influence.
Her expression: angry at Lila (but not too much she is a good girl) and concerned for Sabrina.
Her model:
https://www.pinterest.ru/search/pins/?q=marinette
Her expression:
https://www.pinterest.ru/pin/780670916628699400/

4) Adrien Agreste is a good boy, deuteragonist and love interest of Marinette. He is friend of Chloe. He dislikes Lila but he is very sweet and don't express himself.
His expression: annoyed, but he doesn't show it much because he is good boy and uptight
His model:
https://www.pinterest.ru/search/pins/?q=adrien%20agreste
His expression:
https://www.pinterest.ru/pin/771593348629889362/

5) Lila Rossi.
She is kind of a b even worse than Chloe. While Chloe is loud and straightforward Lila is sneaky and uses lies to gain popularity and ruin lives of her enemies like Marinette.
Her expression: she is smug with a bit of cunning smile because she won Sabrina from Chloe.
Her model:
https://www.pinterest.ru/search/pins/?q=lila%20rossi
Her expression:
https://www.pinterest.ru/pin/729301733393740073/

6) Félix Graham de Vanily
Felix is a half-sibling of Adrien. He is evil. He doesn't like Adrien and Marinette. In this scene he is a boyfriend/partner in crime with Lila.
His expression: just like Lila, he is glad for Lila and he is glad that Adrien is annoyed.
His model:
https://www.pinterest.ru/search/pins/?q=felix%20miraculous
His expression:
https://www.pinterest.ru/pin/443675000793013075/

If we are talking about heights then:
Adrien = Felix
Boys are visibly taller than girls.
Chloe is slightly taller than Marinette.
Lila is something like Marinette.
Sabrina is shorter than other girls.

***Update about backgrounds***
There is no need to be detailed or accurate to angles. It needs to be 3 backgrounds with walls, doors and windows. They need to be different and have style like on pictures.
Here is concept art:
https://miraculousladybug.fandom.com/wiki/File:Coll%C3%A8ge_Fran%C3%A7oise_Dupont_Courtyard_background.jpg
https://miraculousladybug.fandom.com/wiki/File:Coll%C3%A8ge_Fran%C3%A7oise_Dupont_Courtyard_background_2.jpg
How it looks in the show:
https://miraculousladybug.fandom.com/wiki/File:Horrificator_(58).png
https://miraculousladybug.fandom.com/wiki/File:Horrificator_(60).png

*** Here is wiki about Ladybug related stuff with descriptions and screenshots if needed***
https://miraculousladybug.fandom.com/f