My absolute best tip for 2D papercrafting is practice drawing basic shapes for form. Many artists begin illustrations with simple shapes to build their subjects before adding detail.
Papercrafting is devolving your concept back into simple shapes and contours. It’s important to simplify your shapes to be “clusters” if something becomes too detailed. Don Bluth utilized this technique in a lot of his films, especially with hair!
I started papercrafting when I was in middle school, but vastly different from the paper art I do now. I used to make 3D paper models from commercially made paper kits. My father gifted me my first paper kit (like on the left) from Germany and I was hooked!
Unfortunately, it was very damaging to my hand to continuously cut paper for hours on end, so I stopped the hobby around early high school. Years later, with the immergence of tools like Cricut Machines, it saved my hand from a lot of hard cutting labor and I was able to jump back in with new vigor and create my own “paper kits”!