As already mentioned, depends upon conditions. And frankly, not often but sometimes, I have been unable to tell if I have hit or missed. Most times it is clear.
My position on follow up shots .... I will take follow up shots if I am confortable I can make it. Even of I know the first shot was a good hit. If the animal is still up, I am going to try to put another round in it. If I am not certain I can make a second shot after a miss or a well placed follow up shot on a hit, I simply don't shoot.