im trying to create the pink part. but for the life of me i couldnt get the curve part.. any tips? ;'(
I am not quite certainly sure what do you mean "I can not get the curve part".
If I were you I would just add some more loop cut and move them one by one by scaling on X axis to make some curve.
If you're trying to curve the mesh you'll need to add more loop cuts then you can move them into position to form the curvature.
really would recomend to use the greae pencil to daw the main curves on the reference drawing, that will give you a much better idea of the shape you have to follow