Hi, I think that you need to sharpen the pencils more. Then draw the main folds/direction of folds with the tip of the pencil, and draw the shadows with the side of the pencil. You can flip the order and draw the areas of shadows and colour first (going from the general/less defined to particular/more defined). So more variety in using the pencil from thick to thin line will help make the fold more difinite. Try it out and tell me how it goes.