Step 1:
Prefold in half over these four lines.

Step 6:
Prefold over these four lines.

Step 5:
Start with making a valley-fold over the 2 lines indicated by the arrows. Then, make a mountain-fold over the 2 lines next to them. Continue making valley- and mountain-folds until the 2 lines on the top-left.

Step 2:
Fold the corners to the center.

Step 4:
Prefold over these four lines.

Step 3:
Fold the corners outwards.

Step 10:
Sink-fold over these prefolded lines.

Step 8:
Sink-fold over these prefolded lines

Step 9:
Fold the center upwards over these prefolded lines.

Step 7:
Open the model.

Step 16:
Repeat steps 13 to 15 on the other seven petals.

Step 15:
And fold the tip upwards.

Step 12:
Now the model looks like this.

Step 11:
Fold the center upwards over these prefolded lines.

Step 14:
Fold the petal downwards.

Step 13:
Fold the petal upwards

Step 19:
Repeat step 18 on these corners.

Step 20:
And repeat step 18 on these corners.

Step 18:
Fold this corner downwards.

Step 17:
Now the model looks like this.