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Jean,
I'm going to just quickly respond to your query about tangents, before it gets lost in the subsequent discussion.
Often this is couched in terms of not letting objects or shapes "kiss". Imagine, say, two billiard balls, visually side-by-side, their circumferences just touching (or "kissing"). The effect is that it's quite difficult to judge depth, to say for sure whether the objects are in fact side by side, or one nearer to you than the other. If you eliminate that "kiss" by moving one ball slightly into your line of vision of the other (whether in front or behind the other), you immediately establish depth.
Another "kiss" to be avoided might be where the top of the subject's head meets exactly the line of the horizon.
What do you do if there's actually a problem with tangents in nature? You change your composition to get rid of it. Move the billiard balls (either closer to or even farther apart from each other.) Place apple partially in front of the teapot rather than alongside it. Put the portrait subject on a model stand, or take your reference photos from a lower angle. Whatever it takes.
I don't spot any such problems in this work thus far.
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