The hibiscus flower only lasts one day. The darker colors around the edges of this, as well as the bright yellow toward the center, are natural. To the uninitiated the flower appears to be old, or artificial, but it isn't. The lighting is natural.
Nice close up/macro for texture. Is that the natural texture or is the flow wilting just a little? Kinda wish the depth of focus was just a little deeper so I could see the texture of the limb also, but it's ok as is. Just a personal thing with this particular photo. Nice yellow and a really nice photo. Well done.
This really looks like a paper flower but I know it isn't. It is so sharp around the edges, I like how you composed it. It is not centered which enhances it a lot. The leaves at the top are very focused maybe a lower DOF would have been better to blur them out a little.