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I keep finding photogrammetry papers discussing how to get the sizes of objects from photos. But those look like photographs and yet somehow seem unreal. Do you know any good intro to the subject? Something that would show a regular photo and the photogrammetric side by side?

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You can try it yourself with commercial software: http://www.123dapp.com/catch

Scale can be hard to capture in photogrammetry, but in general the unrealness probably has more to do with the somewhat smoothed out (triangulated) surface that doesn't capture too fine a level of detail and the textureless (uncoloured) model they are rendering.

No need for commercial software! Try VisualSFM, Insight3D, Regard3D!

Or OpenSFM: https://news.ycombinator.com/item?id=12835771

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