Step 1:
Prefold in half over these 4 lines and turn the paper.

Step 6:
Squash-fold the flap

Step 5:
Fold this flap upwards.

Step 2:
Fold the corners to the center.

Step 4:
Valley-fold over the 2 lines at the bottom right, then mountain-fold over the two diagonal lines and valley-fold over the 2 lines at the top left.
All lines are prefolded.

Step 3:
Turn the model.

Step 10:
Press these edges downwards / flat

Step 8:
Unfold both folds

Step 9:
Fold this edge downwards.

Step 7:
Fold over these two lines

Step 16:
Repeat steps 13 to 15 with the other 3 triangle flaps.

Step 15:
Close the model again.

Step 12:
Repeat steps 6 to 11 on the other 3 flaps.

Step 11:
Fold the little triangle flap upwards

Step 14:
Fold the little triangle flap inwards.

Step 13:
Pull open.

Step 21:
Repeat steps 17 to 20 on the other three similar places of the model

Step 19:
Fold over these prefolded lines.

Step 20:
Fold the petal upwards.

Step 18:
Pull the upper paper layer loose from both edges.

Step 17:
Fold these two edges upwards

Step 22:
Prefold over this line.

Step 28:
Now the petal of step 27 is on the inside of the flower. Repeat step 27 on the other 3 same petals with less paper layers.

Step 25:
Press the model a little further inwards over the prefolded lines.

Step 26:
This is how the bottom of the model looks

Step 24:
Sink-fold over the prefolded lines

Step 23:
Open the model and turn it upside down, see next picture

Step 29:
Curl the 4 outer petals (with more layers) outwards by just rolling them up tightly.

Step 27:
4 petals are made of more paper-layers then the other 4. The 4 petals with less paper-layers are going to be on the inside of the flower.

The petal above in this picture is made of less layers, make a valley-fold over these 2 lines.

Step 30:
And curl the petals with less paper layers inwards.