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 ...
Most normal frame sizes will require you to crop (or get rid of) some of your photo. So, when you take a photo of your family or your kids try to leave a little room on the sides of the photo in case you want to enlarge and frame the photo.
