Looking good, as for guessing the strain, anyone's guess is as good as your own. Maybe try asking the guy you bought the sack from. It's damn near impossible to identify a strain by a pic, especially given that a plants seeds can grow to become so many different phenotypes, so appearances can be decieving. But whatever it is, looks like the shit, nice structure, tons of pistils, just grow that shit up into something tasty, smoke it, and call it whatever comes to mind.