The Aperture stop of a photographic lens can be adjusted to control the amount of light reaching the film or image sensor. In combination with variation of shutter speed, the aperture size will regulate the film's or image sensor's degree of exposure to light.
The gallery above was taken from an aperture of 1/16 to 1/4.5
Best and worst image (below):
The best image on the right was taken with an aperture of 1/4.5 this gives it a shallow depth of field I think it is better as it makes you drawn to the dandelion. The worst image is on the left. It was taken with an aperture of 1/16 this gives it a deep depth of field. I think is the worst out of the gallery above as the grass is neat and the image isn't as pleasant to look at as the one on the right.
The photos above were taken with an aperture of f29.
The photos above were taken with an aperture of f4.5.
In my opinion the images that were taken with f4.5 are better as the object(s) in the middle don't blend in with the background they're clear to see an the images are more pleasing to look at.