It's just an I-phone that I used to take the picture, and it's several years old, I-phone 4 I think. I make sure to click on the little focus box on the screen when taking the picture, and that seems to make it better. I didn't use any other adjustments (aside from sizing it to 800x800).
Yes, thanks for everyone's comments on the moss. I think I'll plant a few seeds in and around these areas next fall just to see what happens.