Man If you shell out a cool 15 on amazon for a 30-60x magnifying glass you'll be able to tell yourself by looking at the trichomes. And it's fun!
I agree with padawan. It's got a ways to go. It looks like it hasn't fattened up yet and if you let it keep growing you'll get a huge yield increase. I let them grow until the trichomes start to amber and their heads are swelled.