This message seems a bit ambiguous.
Li Shi couldn't help but laugh when he saw her reply.
Women nowadays are so open-minded and proactive. Since becoming successful, he's grown accustomed to it.
Especially since Qiao Qiao is just chatting on WeChat – don't think that when women say things like this, they can actually do it. Often, women can be all talk.
If you naively believe that this is a woman using 'hints' to express something, then it's most likely you who will end up disappointed, not even touching a hair but losing a pile of money.
Sometimes men also need to practice "self-control" and "reserve".
"However, taking my sketching skills from (Proficient-) to (Proficient) will require a lot of practice to hone my basic skills and expression of imagery."
Li Shi was quite casual about it, he just wanted to do more sketching to improve his skills. Although Qiao Qiao is pretty, she's just average, not enough to arouse his desires.
