Webster:Originally Posted by Cheryl Jacobs
Pre•tense 1. a claim; pretension
pre•ten•sion 1. a pretext
I don't intend to put words in to your mouth, but I will stand by what I said earlier. It fits your description. You offer a pretense or claim -- 'my pictures are not snap shots' -- by using the word image, which you seem to view as having a better connotation than photo.