Horatio, they look fine to me but without seeing the edge it's hard to say for sure. My guess is they would be fine. I've killed 2 deer here in NY with stone (flint I think) thanks to a generous member here. I wouldn't have believed stone could be so effective without seeing it myself, but it is. Obsidian is suppose to be sharper than flint so as long as the points are relatively thin, I'm sure you will do fine.
One word of caution though. Several of those heads would not be legal in NY because the ends point backwards and therefor would be considered barbed. If you want to stay legal make sure they are at least 7/8" wide and the rear edge is at a 90' angle to the shaft.