The group one: The photoshop background is ugly. I don't know why it was stretched. Naoko did the same with the Colour Edition covers.... The girls legs reflections don't have the right perspective. But the golden ratio is quite good here.
The couple one: it's soooo 90's. The best illustration she's made so far. Good composition, good narrative, good ratio. Even though.... the feet reflections.... But quite good. I imagine she used a figure skater stock picture to trace because the anatomy is also fine.
I browsed some of the pages of Naoko Takeuchi’s The Cherry Project. The protagonist is a girl named Cherry who figure skates on ice. The genre (romance) is not really my thing, so I didn’t finish the manga. However, Naoko’s notes are fun to read: she expresses a lot of admiration for athletes who skate on ice and she even skated on ice herself.