Don't sell yourself short, those are some pretty good ties! I like those hackle tip wings a lot. They find their way into a lot of my flies too.
One tip: With the GP crests, the tips of the tail and topping should meet, nicely "framing" the wing. Also, try and find a crest for the tail that closely mimics the bend of the hook, so that a mirror affect is achieved.
Again, beauty flies. Keep at it