The punched oval is too small to hold in your hand and punch again. So here is a way to do that. Take your punched shape and put it on the sticky edge of a post it. I think you can faintly see the white dots on the oval that show me where I have to punch again to get the shape I'm looking for. This way you can hold the post it in your hand on the non-sticky side and slide the shape into your punch, line it up, and punch away.
This is just one example. You can do this also on your scallop punch. By rotating the scallop punch slightly, your scallops become pointy giving you a totally different shape.
Without the sticky note, you wouldn't be able to line that scallop up.