Pictures of this type, simple silhouettes,  are quite easy to do, 
and are often successful provided the subject has interest.

Often, the camera will produce a silhouette automatically as it`s
metering system exposes for the bright background.  That depends,
of course, on the proportion of the frame taken up by the
subject.





Unfortunately,  in this case,  some modern exposure systems are
so good  that they try and correct for possible silhouettes 
assuming `correct` subject exposure is required. In such a case, 
a reading is  required  from  the highlight and the  camera 
should  be  set manually, or the over ride knob used.