It is very doubtful that someone could tell you anything about the genetics of a cannabis bud from a picture. Even if they saw it first hand, they couldn't beyond a guess. Someone may be able to say it looks like strain X or strain Y or whatever, but buds from the same strain differ in how they look, sometimes dramatically depending on growing method, curing, etc. You could naroow it down more if you looked at the live plant, because there would be more points of reference to check against, but still, anyone who claims to be able to tell you with any degree of certainty what strain it is should be taken with a grain a salt. Indica or sativa maybe, because they give two different kinds of highs supposedly, but most strains are not pure indica or sative anyway. Most are hybrid.

In short, there is no certain way to know what strain you have, unless the grower or breeder tells you.