Unless you are getting it direct from a grower, someone very close to the grower, or a "legit" source like a medical cannabis club there really isn't any way to tell exactly what you've got. A lot of people say they've just gotten some Northern Lights, Haze, Trainwreck ect, but I would bet that in most (certainly not all) cases their dealer is just telling them the name of some good strain he's heard about. I don't know of anyway to determine a specific strain from a picture of a dried bud or even the bud itself. Maybe some expert growers out there might be able to but I would think they are few and far between.

What I, and a lot of people, have found, however, is that you can tell if a strain leans more towards the indica or sativa type depending on the high it produces. Buds that are mostly indica have a more pronounced body stoned type of high, the kind that keeps you on the couch. Sativas have more of an up, brainy high, the kind that can get you seriously wasted but won't put you to sleep. It sounds to me like what you've probably got now is an indica dominant strain. I could be wrong though, it wouldn't be the first time. Anyhow, I hope this helps.