We all remember from English class the rule of Subject -- Verb Agreement, which means you wouldn't say "That book are great?" but rather "That book is great." The same rule can be applied to photography, if we look at how the subject of the photo relates to the framing of the picture, what I call Subject -- Frame Agreement. The most common incident where we find this error is in distance. Being too far away from the subject ...
If you are planning a party, create a specific hash tag (ie #jens40thbday) so if everyone who takes photos with their smart phone uses it you will have a unique collection of photos from your party.
