That is a good tye. You are getting there. Yes, I think the tail is too long and the wrong material. The tail on the Hare's Ear is fur from the Hair's ear. You could also use some Peacock Herl as the wing case. I realize you don't have all of your materials yet. Do you have any fur to use for a tail?
If you want to be a great nymph tier I recommend this book: Tying Nymphs
by Randall Kaufmann. It is expensive but well worth it.