You can make an picture more effective by shooting through something in the foreground to form a frame for your main subject      
 

 

The tree trunk and overhanging branch form a traditional frame for the image of the house and garden.

       
     
     
     
     
     
     
     
     
     

 

 
         
                 
                 
  A natural frame of trees          
    The tree trunk and the willow branches form a natural frame for the bridge and the river.      
     
     
     
     
     
     
     
     
     
     
           
           
           
  The dark passage frames the bright courtyard          
 

This narrow passage frames the image of the courtyard beyond      
     
     
     
     
     
     
     
     
     
     
                   
  A Vignette frame          
       The dark frame is formed by burning in the corners of the image to form a menacing sky

 

     
     
     
     
     
     
     
     
     
     
     
     
     
             
  Unusual frame          
         The work mans head is framed by the blades of a ships propeller