Good job Alain. Your final image is well done as is the technique used to realize it. However I think your definitions are somewhat deceptive. With reference to your quote of him I would reply that Aristotle said many things but I believe his greatest emphasis was OBJECTIVITY. A is A, his "Law of Identity".
I make photographs of things I have a particular personal response to, emotional or rational, and am thereby an interpreter. The objective part is that I have recorded a moment in time. The moment; unique, of itself. What I saw, what others may have or will see then or some other time. If I, in a darkroom or on a computer, manipulate a photograph to compensate for contrast, lens flare or other technically deficient aspects I do so only because my eyes see so much more than the camera can record. What I will not do is compromise the moment by the addition or subtraction of anything that was or was not present in that moment. Were I to do so I would then become a photo-renderer. Nothing wrong with that of course but the distinction is clear - to present what was originally a daytime scene as a morning scene is deceptive, even if only I know it. What would your blurb read beside such a print hung in a gallery? Aristotle also wrote that "reality is absolute". Is it?
Do you truly think a documentary photo can't be artistic? Moonrise Over Hernandez for example; what could be more documentary? But it is truly a work of art because Mr. Adams saw the combination of elements, composed, exposed and printed it in such a way as to capture the essence of a moment through his own personal vision. As a b/w picture it's highly interpretive, the printing adds to the impact as well but at its core is the moment.
The debate about what is/is not art is old and boring in its ultimate meaning. I mean, who cares? It's just a label so folk can identify something in a relative manner. For the record, to me, art is any personal act of creativity. Any. But it's moot nonetheless. In your teaching role I would hope you would encourage personal creativity and soft-pedal the art thing. Your collaged image is a good example that of as a goal - to express yourself. Use the tools at your disposal to realize your vision. But honour your subject by trying to capture it's essence in that moment instead of guessing at it at a later date.
I think traditional photography has evolved in a manner adverse to the moment. I used to look at pictures and try to feel the moment. I don't anymore because it seems less important than the "art" of the picture. Shame really.