= new reply since forum marked as read
It takes a trained eye to 'really see' what's in the view finder!
In my earlier years as a wedding photographer I was always focusing my 'eye' on the main subjects and ignoring little details in the background.
One time in a beautiful park setting I had a lovely couple in THE perfect spot - sun was right - gown was flowing - groom was happy (not always happening for wedding photographers - trust me!) - and a huge yellow garbage can was sitting just off to the left of the bride - that I saw for the first time when the proofs came back!!!!!
(yeah, this was the dark ages - FILM - not digital!)
Really - learn to look at the ENTIRE frame! 
it took an "air-brush artist" to fix it - and indeed she did!
This was ALL pre-digital - make it work however you can!
Oh, yes - it was a lesson well-learned - trust me.
Attention to such details are things that do separate the 'novice' from the Pros. 