Another point that needs to be considered is that the background of the subject needs to be the complimentary or of contrasting colour to the subject for optimal visual impact or dramatisation.
For example a green field behind red flowers is an example of good contrast. The blurred green field in the background would make the red subject to stand out.
Another tip is to stop down to a larger aperture, which means a smaller f-number. You can try starting with f/2.8 with a steady camera grip or firm rest. Use tripod stand and timer trigger or cable release.
Also, experiment with your distance from the subject for more creative and dramatic photography. Being a little closer to your subject or further away can increase the drama of your picture.
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