I think one of the best parts about this chapter that not a lot of the people here are talking about is the fact that the chapter starts with Nao-Senpai trying to improve his skiing skills on his own.
In the last chapter, Senpai was upset that his lack of skill made Nagtoro have to in a sense babysit him when she could be enjoying the ski trip to its fullest with her friends. He felt like he was holding her back and decided that the best course of action was sit out on the trip and let Nagatoro enjoy herself. Then after a talk with Gamo and Yoshi, Senpai puts his gear back on and heads out.
The way the last chapter ended, one may think that Senpai would be trying to look for Nagatoro so that she can help him learn how to ski and in turn spend more time together. Instead he's trying to get himself to a level he deems is acceptable without Nagatoro's help.
Senpai knows that the way he is now is not enough, at least in his mind. He doesn't want Nagatoro to feel burdened by his weak points. He wants to work on improving himself because he wants Nagtoro to fully enjoy being with him as much as he does being with her. Look at pages 5 and 6 and tell me that's not why Senpai is out there.
If this was Senpai from the first few chapters, he would've accepted the fact that he's sitting out on the trip because he was generally apathetic to most things in his life not related to art and otaku hobbies. If this was Senpai from say volume 4-6, he would've stayed behind while throwing himself a passive aggressive pity-party about why he wasn't naturally suave and capable. Now look at what he's doing, taking the time to fix on his shortcomings so without having Nagatoro there to force it on him.
The ways Senpai, as well as Nagatoro, have changed throughout the course of the story is staggering. Even more impressive by the fact that this character development comes of as totally natural and not forced or rushed like other manga tends to do.
Some of the commenters are saying that there's "no progress" in this manga. While the relationship between Senpai and Nagatoro has been in this "sort of dating but not really" limbo for a good chunk of the manga, the development both Senpai and Nagatoro have been through, as individuals and as a pair, should go to show that progress in a romance manga is not solely defined by the relationship status of its leads.