All the breeds have been trimmed for breeding, and you are not looking at the once beautiful Jacobin, but they now look like a Mohawk Indain with their chain cut off and rumps trimmed for breeding. The fall moult will replace all their beauty back again. Fertility sometimes hinders the desired long, slim-bodied Jacobin from proper copulation. Again Patience played a big role during the breeding season and especially at moulting time. One can never get enough in this department when it comes to Jacobins.
Most beginners look mostly at the beauty in their profile with that big, round hood.
You should have a nice wide cap at the top. Does it carry well over the head and cruves into the top part of the chain. By having this, the chain will form an unbroken circle. Look at the chai again. Look at the extension of the chain from the face.