I can't get good with just one try, so I gathered what I learned from my first attempt and gave it another go. I realised that Lee Kow Fong drew bigger. That allows for more detailing. So I drew bigger too, something I'm not so used to after drawing in my A5 sketchbook for so long.
I also realised that I didn't need to put in the pen lines and darker pencil lines only after I applied the watercolours. I could draw them in first. That way, I could see clearly the lines for the main characters and foreground plants.
I also realised that I don't have the same colours he uses. But that's ok. My goal is to learn his principles but I can stick to my own colour preferences. I'm not trying to make my paintings look exactly like his. That is what he likes his painting to look and I have my own preferences.