Have you visited the Painting Loft? I painted this from a reference photo posted there. I have tried magnolias many times ... I just love the overlapping, cupping petals, and of course the color.
The dark background caused me some frustration. I have a hard enough time with darks,but this paper--Winsor & Newton--was most uncooperative: the paint just kept being absorbed, wash after wash, leaving little white pinpricks and a dull surface.
I took what W&N paper I had left straight out to the trash!