Short answer no… There are two main ways to tell if your buds are ready to harvest. First way (and a little less accurate) is to look at the hairs on your buds. It looks like on the bottom picture that the tips are starting to go from the fatter white hairs to the smaller, dried out looking hairs. Your buds are done when they are about 90% to 100% brown/dried out. From what I can tell it looks like one more feeding needed and then start flushing your plants.
The second method is to get a microscope (they are pretty cheap from amazon). If you look at the trichomes at the beginning of their development they are clear. As they mature they will become cloudy (early stages of being ready) and eventually turn amber (late stages).
Hope that helps, and good luck with your grow!