Your spey flies are very nice. I especially like the "green" one for its coloration.
The Rusty Rat would look more "full" if you use a larger grizzly hackle. Tie it with a hackle that has barbs that reach or nearly reach the hook point and it will fill out nicely. Shortening the flass body veiling so that it ends just in from of the tail tie in would also help with it looking more "full" because doing so would have your eye pay more attention to the front of the fly.