I think Ray shows us what I've been talking  about. We know what size the trees are, and of course the Taj looks huge when viewed from this angle (unfortunately, we know how big the Taj is, so to a certain extent the excerise falls on its ass) 
For something like Uncle's pic where the size is uncertain, we could indeed change the angle so that Uncle's water-features/pools/ponds/lakes are seen in the same manner as those of the Taj. Then, as if we were standing at the far end of the water, add something a simple as a leaf floating in the water. The perspective then speaks for itself.

I believe we saw a pic of Diana (Princess of Wales) sitting on the stone in front of the Taj (imagine this in Ray's pic) A perfect example of a 'known' object giving creedence to the 'unknown' object in the distance........I'll shut up now - I'm beginning to sound like Donald Rumsfeld.

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All the Woes of a World by Jonathan Icknield aka The Bryster

And in my final hours - I would cling rather to the tattooed hand of kindness - than the unblemished hand of hate...