Your tyes look good. It is really up to the tyer as to how long you want the tail on your jig. If it works for you it's right. I try to match my jigs to the size that the shad are in the waters you fish. In the spring our shad are about 1" or so long and as the year goes they grow until fall when most will be closer to 2 1/2" to 3" or larger. Each lake is different and sometimes the crappie wants a smaller profile. If you match the tail length to the hook shank length you will be close.
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Ascend 133X 13' - MotorGuide Xi3 & Mercury 4