That was fun!
This class was on my list for a while, and I'm glad I finally got to do it. My project is a little bit different because I was inspired by a scene in the movie Mary Poppins Returns :)
For the clouds and light reflections, I used white gouache.
I used masking tape to protect the ballons while I was painting the background.
Also, I used a thinner paper for this (I was not planning to paint a background at first), that's why the paper buckled a bit.
Here are some pictures: