Photogrammetry: What Not To Do: Dark or Small?

Trying to create a model of a Panasonic Insta-something camera. (My wife loves it):

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This is what I got (sparse, dense):

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Looking from above, there might be some lens distortion – the edges of the room do not appear to be square:

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In general, though, I think the problem is that a) the model is too dark, and b) the model is too small. 

I decided to switch models for something lighter, and take the pictures closer up.

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