Welcome

Really tough to tell the weight by pics or looking at bud, because some are more dense than others. If you are going to be buying off the street, I'd get a mini scale for yourself to keep at home (just don't carry it around with you, as it can be seen as intent to sell). You can always calibrate with a nickel, which is exactly 5 grams.

As for whether it's good... Well, there are so many opinions and preferences, but personally I'd look for a couple things: are there a lot of seeds and stems? The less, the better; No seeds and small stems is the best. Then, if the bud is dried properly (evenly inside and out, stem snaps when bent). Finally, the effect, which is always different. Some will work better for others and so on, so it's really tough to say. The more you smoke, the better you will get at knowing what is good bud - in general and for you :jointsmile: