Big Ben and houses of parliament Depth of Field being used creatively - I feel this gives a much better effect than having shot the image with a smaller aperture which would give a bigger focus in the image (so Big Ben in the background would have been in focus too).
There are a few things to point out in this picture, first thing, depth of field, this picture makes the mushroom the main focus, whilst the background is blurred. Also, we can see the texture inside of the mushroom. I like this picture the most it is zoomed in, and the texture is smooth.
10 reasons why your photos aren't sharp (and how to fix them)
Getting sharp photos is one of the fundamental goals in photography. If your images aren’t as sharp as you’d like, take a look at our ten-point guide to work out where you’re going wrong and how to get it right next time.