The reason I say your flies are on the edge is it looks like you purposely spike the ends of your wings. They don't have the traditional up turned point. Did you do that on purpose?
As far as displaying flies in my opinion I have never tied a full dress fly worth showing of. I just try to tie descent looking and durable hair wing flies, for fishing. The cheapest way to display flies is in what they call a Riker mount.(I'm not sure of the spelling) Go to
www.stoneriveroutfitters.com talk to Dan Fitgerald, he can help you. I like your choice, putting the flies under glass on a cider root. It gives the display three dimensions.
Russ