Start working from the back. The patterns are generally never numbered for your convenience, so figuring out which petals are under other petals will be your task.
G = Green Y = Yellow/Gold R = Red P = Pink
First, I added the dark green leaf (upper left). Then the lower red petals were added. I went to the back side of the block and stitched a contrasting thread on the sew line, so I know exactly where to place the next petal.