I saw a post by a man on google plus, and thought I'd share because his ideas and suggestions seem to have helped me get better quality scans.

1. Clean = bad. For best results I splatter paint and scribble on the object. More details gives the photogrammetry tool points to "lock-on" and then track across several frames.

2. Use something with a lot of detail as the base (like a book)

3. Uniform light across all photos. I use a DSLR with an external flash pointing up, bounced off the ceiling.
Does anyone have anything to add? I've really foudn that putting the splatter of paint on my objects, makes for cleaner scans. Fascinating, right?

Here is an example (from the same guy on google plus)