Yes, the background is yellow (and blue). basic composition iprinciple is that what is in focus is the most important item, the part you want me to see. That is the flower pistil/stamen (i am not a biologist...) and it is orangey-brown. More DOF would have made this a much better (to me) image.
Seems like this might have been a stronger picture in terms of the competition subject if the petals had been in focus, leaving the stamen out of focus. Hard to say without a comparison. 6