Photos of OPK tracking

Samantha
I'm wondering how many ladies on here save their OPKs and label them, with the goal of <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a> each month. I've been TTC  for almost a year now and just started saving all my OPKs two months ago. 
For those who save the tests, how do you track them? Tape them to paper and write the dates? On what CD do you start and stop taking OPKs each month? Do you get a positive around the same CD each month? Any tips to share?
Whether you have tips or not, I'd love to see photos of how you track! Here's mine...