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Comments

That blade of grass really dominates the frame, which is a pity. I had a go at removing it but it's tricky because the background tones on either side of it are subtly different. Much better as John says to watch out for such problems when taking the shot, and move round a bit. You can also do a bit of 'gardening' to remove intrusions...
Once you get the shot without distractions, a square crop would suit this nicely.
Moiracrits
Once you get the shot without distractions, a square crop would suit this nicely.
Moiracrits

My first thought was as John's above...that naughty blade of grass !!
A little more 'gardening' would be in order I think, just to remove some of the grass infront of your subject.
Slightly over exposed on the top of the shroom,a small diffuser would be the solution ( you can easily make one out of something like tracing paper ), just to reduce the light a touch.
Nice low POV. A hefty crop would be my way forward to really put your subject in view. I'll try a mod.
A little more 'gardening' would be in order I think, just to remove some of the grass infront of your subject.
Slightly over exposed on the top of the shroom,a small diffuser would be the solution ( you can easily make one out of something like tracing paper ), just to reduce the light a touch.
Nice low POV. A hefty crop would be my way forward to really put your subject in view. I'll try a mod.

With an aperture of 1.8, you only have a small area in focus. In other words, it gives you a small depth of field. So only the front rim of the mushroom is in focus. Maybe this was your intention. It's quite a creative approach, which a lot of flower photographers use.
As to composition, you have a lot of "dead" space around your subject. In my modification I have cropped and placed the mushroom over to the left of the frame, on a thirds intersection (see Rule of Thirds).
I also used the Clone Tool to remove that background stem from behind your subject.
Pamela.
As to composition, you have a lot of "dead" space around your subject. In my modification I have cropped and placed the mushroom over to the left of the frame, on a thirds intersection (see Rule of Thirds).
I also used the Clone Tool to remove that background stem from behind your subject.
Pamela.

Well done for the low viewpoint as it's on a level with the subject.
The wideaperture isolates the subject well, though I'd have tried a smaller aperturtre (but still wide) to improve lens performance but mainly to get some more of the subjec sharp. f/4 would be worth trying.
You've got an attractive and uncomplicated shot (interesting to note how many close-ups have reall badly distracting backgrounds) so it makes the small things stand out more. The blae of grass that's been mentioned, it may be well out of focus but is quiote intrusive given the smoothness of the rest of the image.
The subject is also very central, and an off-centre placement looks more relaxed. Cropping solves that, but do you place the subject on the left or the right of the image? Try both.
The wideaperture isolates the subject well, though I'd have tried a smaller aperturtre (but still wide) to improve lens performance but mainly to get some more of the subjec sharp. f/4 would be worth trying.
You've got an attractive and uncomplicated shot (interesting to note how many close-ups have reall badly distracting backgrounds) so it makes the small things stand out more. The blae of grass that's been mentioned, it may be well out of focus but is quiote intrusive given the smoothness of the rest of the image.
The subject is also very central, and an off-centre placement looks more relaxed. Cropping solves that, but do you place the subject on the left or the right of the image? Try both.