Hi @devasish thanks for your advice.
But the white flower's pics were taken from Samsung and the red color flowers from my smartphone Honor.
Actually Honor has got a good quality Sony camera!!
Moreover the pics of the white flower were taken during noon in hot Sun, So we could not avoid the natural sun light. :(. And red one's were taken during evening. So the natural light too matters a lot.
Me and my husband both being artists, we know very well how to focus. But sometimes while taking the pics of Creepers and plants, because of the wind it shakes even though we hold our phones properly!!
These flowers are not very small, but about 2 to 2.5 inch in size.