Harvest when the heads on the "bolbuous" trichomes turn foggy. Clear heads indicate immaturity while amber heads indicate the beginning of degredation. A hand held microscope from Radio Shack ($10) or a jewlers loupe will help see them clearly.
By the pictures, I say they're still way inmature. 2-3 weeks to harvest..at least would be my guesse.
trichomes are the sparkly crystal looking glands that should be prominent/evident on your buds. "Bolbulous" triches are the ones that look similar to mushrooms. They mature in three stages, clear=immature, cloudy/turning white=mature, amber=beginning to degrade.
Here's a pretty good link.. http://greenmanspage.com/guides/harvest.html