Welcome Rishi. I hope you will show us more of this beautiful flowers, so exotic to us.
With the focus Rick is right. Photography at such a close distance is a little harder, than wider shots. AF systems are sometimes misbehaving and is sometimes logical to switch to manual focusing to get the things right. Sometimes tripod helps. They say, that tripod with digital camera is worth of 3-4 stops. That will give you much deeper depth of field or faster shutter to reduce effect of movement; yours or the subject's and eventually giving sharper picture.
Good luck to you and learn fast !