So what have I learned so far...

Taking stock of the things I have found helpful when capturing close up photogrammetry:

The shoot:

• Overcast or cloudy days are ideal for capturing neutral lighting on models. Stark lighting looks pretty in the capture, but makes the resulting asset much less useful if the intention is to use it in a game engine. 
• If you have a variable length lens, use either the minimum or the maximum. Ideally as close to 50mm as possible to minimize distortion. Agisoft Photoscan says it supports between 20-80mm, but I've got some good results with an 18mm lens too. 
• Take Photos. Yeah, duh, but no, really, take more photos than you think you will need. It's easy to exclude some from the capture, but it's not so easy to get more pictures once you realize you missed some vital angles. 
• Shoot in RAW if possible. It reduces noise, and helps for a better reconstruction. 
• Shoot with the lowest ISO possible, which will also reduce noise. 
• ANGLES! Get all the angles. 
• Get close, take nice little detail shots, but make sure your pictures have a good amount of overlap, otherwise the software won't be able to place them.
• Avoid reflective or transparent surfaces. Puddles, glass, shiny metal, it will mess up the processing of the capture. I've read that a polarizing filter can help, but I have yet to try it. 
• Focus! Blurry photos will confuse the software and muddy your results. 

The subject:

• I like to just go for a hike with my camera. There are amazing things to capture everywhere. I think it's funny that people won't look twice at a real traffic light, but upload it as a model online and people will just start poring over the details...
• Not everything makes for a good capture. Reflective surfaces, very thin elements, repetitive elements, featureless areas and very dark areas can result in poor models. 
• Small vegetation (eg; grass, leaves) and wind are the enemy- even slight movement in the subject can mess up your capture big time. 
• Complex shapes need more care and attention to detail. Kinda sounds obvious, but this is one of those "ANGLES" and "Take Photos" tips really count. Photoscan knows nothing about the object other than what you tell it, and it can be hard sometimes getting all the angles. I tried getting a cool water valve the other day, covered in ivy, and I got *most* of it, but not enough to make a good model. 
• Rocks, tree roots, bricks, doors- these are all good starting points. 

That's all I have for now!