In your photos you do not need all of the object to be in sharp focus. But make sure that the focus is on the bit that you want to be sharp.
Put the sharp focus on the thirds, this really helps to draw your eye. Nigella's are in season here and is a different sort of flower to the normal. I focused on the twirly bits.
Remember it is Macro Monday so try to get in close and show us the interesting bits in sharp focus.