My question is, do I post my progress piecemeal in the Pictures section or do I wait until I have all blocks are made so I can show them as a whole? I would prefer to show the board-at-large my whole collection, as there is much less confusion.
As I said before, personally I don't understand why someone would
not want to post their work in progress in Pictures. So many people seem to enjoy looking at those pics. But if you want to keep it in PDA until it's finished, then go ahead. Of course it's better to post some pics in PDA than not to post at all until your project is ready.
On a global scale, I'm worried that the board might get fragmented and end up with effectively two "Pictures" sections. But we are a long way from such situation. So let's not get into it now.
For now, feel free to continue using PDA as you see fit.