Why would this image be abstract photography?

An abstract photograph is something that is presented in a way we would not usually look at or interpret things. In this case, it look like it's near the bottom of the plant and the photograph is taken as if it were stuck inside the plant. We usually don't stick our faces in a plant right? It is close up as well so at first glance, it could be difficult to understand what it is. The photograph is focusing on a small fragment of the whole piece.

your word would be isle.

isle is an island or peninsula especially a small one.

if you add the letter "a" you get aisle, which is a passage between 2 rows of something like chairs, shelves, or something else.