Tool: origami.

1. First, prepare an origami and fold the trace along the diagonal.

2. Then fold the trace in half from the edge to the middle, and fold the four edge creases in half again.

3. Then, knead the folded four corners into solid corners, and press the four corners into a windmill shape in turn.

4. Then press the bottom of a corner with your thumb and fold it in half along the center of the corner.

5. Then fold another adjacent corner and fold four corners at the same time in turn.

6. After folding, fold the four corners of the origami to the center in turn and roll out the petals on both sides of the origami.

7. Handmade paper roses are finished, as shown in the figure below.