First step is to look at the trichs. Go to RadioShack and get a 60-100X handheld microscope thing for $8. Search this forum for "trichomes" and you'll find pictures on how to use them in determining when to harvest.
Looks like a nice bud though!
If you haven't already harvest, I suggest taking a small sample and flash-drying it to see if it's what you want. I've seen it too often that people have cut it down a week early and decreased their yield and potency significantly because of it.
I also suggest that you wait to harvest until...