One of the tools I most often use is tracing paper. Most of my design is printed beforehand, but small changes or a shapely sky can easily be made with some good old fashioned tracing paper.
Here I drew the design on the muslin background (the cloth for you non-fabric folks) in chalk. Then I pinned tracing paper to it to and traced those lines. You might ask why I didn’t just trace it straight on to stabilizer or blue sky fabrics.. I have to make all the pieces upside down. And after a lot of tries it’s a lot easier to work with the template in reverse.. 🤯 yeah, getting heady over here.. so the short answer? After a lot of trial and error this is what works so I don’t mess up more than I naturally do. 🤓