Step 1:
This is a pink paper taped to a black paper.
Prefold over these two lines

Step 6:
Use transparent tape to make the model flat and shiny.

Step 5:
Fold over these (prefolded) lines, start with the two lines in the middle, then work outwards.

Step 3:
Fold the edges to the centerline.

Step 2:
Fold the corners to the center.

Step 4:
Fold the edges to the centerline.
Then unfold the model.

Step 7:
Tape / glue both ends together.

Done!