This position is wrong for many reasons. The major one is the calf is upside down. With the calf upside down it causes everything else to be wrong. Now the legs are in the wrong place and aren't the first thing to come out.
This calf is also in a very wrong position. If the head doesn't come first it puts even more stress on the cow during delivery. Furthermore, it could damage the animal since the head would be coming out last it could have problems getting out of the uterus.
There is only one problem with this calving position, the legs are not out in front. This could make calving slightly harder on the cow. Along with this it could damage the limbs of the animal if they were to get stuff on their way out of the uterus.
This position is also only slightly wrong. The only problem is that only one leg is in the correct position. IF the calf came out like this it could damage the mother and possibly the Calf's leg.
This Position is very wrong and very damaging to the calf. The calf's neck is bent back and causing the head to be in the wrong position. This makes it more difficult for the cow to give birth. It could also damage the head of the calf.