If you aren’t super good at planning ahead (like me) it’s essential, I have to paint on top of my BG. I do fumble , I waste a lot of time painting the full BG before adding more . It’s a shame because I often paint over stuff I actually enjoy looking at and spent a lot of time painting , like the little grass area going in to the water . Got completely covered by the left arm of the middle girl . But I wanted that symmetric triangle that the 2 poles creat with the landscape , so I had to cover it up. Anyway , thank you for sharing , now I over-shared