I like that you were building with lots of different colors. It looks like a lot of fun. It's nice to have some small pieces of paper to just play around with, and not take too seriously, especially when you're just sort of trying to get comfortable with a new medium.
If you're using a heavy watercolor paper, sometimes you can go back and "scrub" off a bit of the paint, in areas that you feel are a bit too heavy-handed. But you have to be careful, or you'll scrub away the paper! lol (Not that I've ever done that...... 🙄)