We are aware of what contrast is. What if the contrast in the photo is not just in terms of light and colour, but rather in terms of physical objects? Then what we have done is juxtaposition. If done correctly, this is one of the best techniques to create a photo that shall speak volumes for itself.
It might feel tricky at times, the simple way is to find contrasts, in terms of physical description, age, emotion, weather….virtually anything and everything.
Last time, J was for JPEG vs RAW.
Good luck shooting some amazing shots out there, Cheers!