The only way we can have any bit of a clue is the fact that you don't have a lot of new hairs growing, and it looks pretty well formed. Other than that really you can only truely tell by the color of your trichomes. Like the poster above said.
Clear = not done
Cloudy = Thc
Amber = CBD
Is it a sativa, indica, or hybrid? Do you know how many weeks of flower it has been?
You need to buy a microscope from radioshack.