I love this one with blue background it has more of photographic look with the flowers;
It is lovely in those shades and mother nature is always designing a new beautiful shade.
This had me puzzled so I went to my tree & picked a flower from my white tree some buds at different stages and a leaf. The tightly closed bud is very close to the creamy brown in your other photo with a pinkybrown colour stem with pink tip on the end of the petal, the more open bud as photo above has a pinkybrown colour stem then a thin streaks of pink leading quarter the way up the petal which when opened it lays in the centre of each petal & the petal is a very pale yellow thining out to white on the ends. My full flower is a deep yellow in the center & gets lighter as it rears the petal tipto white. Trees growing in different soil show different colours. my leaf is about the colour as your top leaves in shadow. hope this helps. This stitchout is lovely . I didn't think about the colours as they were white with a yellow throat. Thankyou for making me look closer.
There must be several colour variations even on the basic white with yellow centre because in the outdoor court yard in on of the local shopping centres there are frangipanis &the white ones can vary .This is where I ended up bringing home fallen flowers from,